In everyday PC-based CAD usage, the most common deliverable remains 2-D drawings (plans, sections, schematics), even though advanced systems also support solids modeling and simulation.

Introduction / Context:
Computer-Aided Design (CAD) tools range from lightweight drafting packages to high-end parametric modelers. While 3-D and simulation are increasingly important, a large fraction of day-to-day outputs across architecture, civil, electrical layouts, and mechanical detailing are still 2-D drawings used for bids, permits, manufacturing, and as-built documentation.

Given Data / Assumptions:

• We focus on typical PC CAD workflows.
• Organizations often require printable drawings for contracts and shop floors.
• 2-D geometry remains efficient for many drafting tasks.

Concept / Approach:
2-D drawings convey dimensions, tolerances, symbols, and notes succinctly. Even when 3-D models exist, drawings serve as legally controlled documents and communication artifacts. Specialized tasks like circuit simulation or finite element analysis use different toolchains; solids modeling is common but not the primary output in many general CAD contexts.

Step-by-Step Solution:
Identify the primary deliverable requested by stakeholders: drawings.Note that 2-D drawings are ubiquitous across disciplines.Recognize that simulation/modeling are either specialized or upstream steps.Select 2-D drawings as the most common product.

Verification / Alternative check:
Standards (e.g., dimensioning, GD&T, architectural sheets) and procurement documents still revolve around drawing sets, confirming their centrality.

Why Other Options Are Wrong:
Solids modeling: widely used but not the majority deliverable across all users.Circuit simulation: domain-specific EDA, not general CAD output.Finite element analysis: engineering simulation step, not the common output for most users.None of the above: incorrect because 2-D drawings are prevalent.

Common Pitfalls:
Equating the availability of 3-D tools with universal 3-D deliverables; overlooking that fabrication/permit processes may still mandate 2-D documentation.

Final Answer:
2-D drawings