In the context of Smart Cities and the Regional Smart City Initiative, which of the following is NOT one of the four core pillars of smart planning?

Introduction / Context:
Smart city planning focuses on a small set of core pillars that guide investments and policies so that cities become more efficient, livable and future ready. Many competitive exam questions check whether you remember these standard pillars or can identify an option that does not belong in the officially stated list. In this question you are asked to pick the option that is NOT one of the four pillars of smart planning connected to Smart Cities and the Regional Smart City Initiative.

Given Data / Assumptions:

• The question refers to four specific pillars of smart planning.
• Options given are Mobility, Sustainability, Infrastructure, Connectivity and Security (as an additional distractor).
• The standard four pillars in this context are Connectivity, Mobility, Security and Sustainability.
• You must choose the single option that is not part of this commonly cited quartet.

Concept / Approach:
Smart city frameworks usually group goals under a few memorable headings. In the Regional Smart City Initiative documentation, the four pillars of smart planning are Connectivity, Mobility, Security and Sustainability. Connectivity refers to digital and physical linkages, Mobility covers efficient transport, Security deals with safety and resilience, and Sustainability focuses on environmental and long term resource use. Any option outside this list is the correct answer here.

Step-by-Step Solution:
Step 1: Recall the four named pillars for smart planning in the concerned initiative. Step 2: List them clearly as Connectivity, Mobility, Security and Sustainability. Step 3: Compare each option with this authoritative list. Step 4: Mobility matches one pillar, so it is not the answer. Step 5: Sustainability also matches one of the four pillars. Step 6: Connectivity is again directly one of the four pillars. Step 7: Infrastructure does not appear in the standard four pillar list and therefore is the odd one out.

Verification / Alternative check:
A quick cross check method is to remember that these four pillars are often abbreviated mentally as CMSS: Connectivity, Mobility, Security and Sustainability. When you write down the initials of the options, only one does not map easily to this memory aid. Infrastructure is a broad concept and is certainly important for any city, but it is not named as a distinct pillar in this specific four pillar framework.

Why Other Options Are Wrong:
Mobility: This is explicitly one of the four pillars and relates to transport and movement of people and goods in a smart, efficient manner.
Sustainability: This pillar relates to environmental balance, energy efficiency and long term viability and therefore clearly belongs to the standard set.
Connectivity: This covers digital networks, broadband and integrated transport links and is again directly named as a core pillar.
Security: Often added in explanations to refer to safe, resilient and secure cities and is part of the cited four pillar model, not an outsider.

Common Pitfalls:
Students sometimes over generalise and think infrastructure must always be a named pillar because infrastructure is indispensable for any development strategy. Another mistake is to guess from what feels important in everyday language instead of recalling the precise vocabulary used in government or policy documents. Some candidates also confuse the four pillar model with other smart city frameworks that highlight different sets such as economy, people or governance. Always anchor your answer in the exact wording of the referenced initiative.

Final Answer:
The option that is NOT one of the four core pillars of smart planning in this context is Infrastructure.