In the calendar of international observances, November 30 is observed each year as which of the following special days?

Introduction / Context:
This question checks knowledge of lesser-known but exam-relevant observances. Computer Security Day, sometimes called International Computer Security Day, is observed on 30 November. It aims to remind individuals and organisations about the importance of protecting computers, data, and networks. Many GK and IT-awareness questions include this date because computer security has become a critical topic worldwide.

Given Data / Assumptions:

• The date in question is 30 November.
• Options given are Computer Security Day, United Nations Day for South-South Cooperation, International Cooperative Day, and International Human Solidarity Day.
• We must determine which observance is correctly linked with 30 November.

Concept / Approach:
The United Nations and other organisations celebrate many different international days. United Nations Day for South-South Cooperation is observed on 12 September, International Cooperative Day is celebrated on the first Saturday of July, and International Human Solidarity Day falls on 20 December. In contrast, Computer Security Day is the only observance among the options that is actually tied to 30 November and is highlighted in many IT-awareness campaigns.

Step-by-Step Solution:
Step 1: Focus on the key information: the date is 30 November. Step 2: Recall that Computer Security Day has been observed since 1988 on 30 November to promote cybersecurity awareness. Step 3: Check each option against known dates. United Nations Day for South-South Cooperation is associated with 12 September, not 30 November. Step 4: International Cooperative Day is linked with the first Saturday in July, so it cannot fit 30 November. Step 5: International Human Solidarity Day is celebrated on 20 December, again not 30 November. Step 6: Therefore, the only observance that correctly matches 30 November is Computer Security Day.

Verification / Alternative check:
Cybersecurity awareness documents, university IT departments, and international-day calendars clearly mention 30 November as Computer Security Day. These sources confirm that the date is specifically dedicated to encouraging safe computing practices and data protection, which supports the correctness of this answer.

Why Other Options Are Wrong:
United Nations Day for South-South Cooperation: Observed on 12 September to promote cooperation among developing countries, not on 30 November.
International Cooperative Day: Celebrated on the first Saturday of July to honour cooperative movements worldwide.
International Human Solidarity Day: Observed on 20 December to highlight global solidarity and efforts to reduce poverty.

Common Pitfalls:
Students may misjudge this as a United Nations related date because several UN days fall near the year end. Another pitfall is not being familiar with Computer Security Day at all. To avoid confusion, it helps to specifically memorise that 30 November is associated with computer and information security rather than with humanitarian or cooperative themes.

Final Answer:
Thus, November 30 is observed as Computer Security Day.