In computer-aided design (CAD) environments, which input symbol or mode categories are typically available for creating basic geometry and annotations within a general CAD system?

Introduction / Context:
General CAD systems provide tool palettes and input modes to create and edit geometric entities and annotations. Understanding the common categories—primitive shapes, curves, and dimensioning/notes—helps new users quickly sketch designs and produce manufacturable drawings that meet drafting standards (such as ISO or ANSI).

Given Data / Assumptions:

• The CAD system supports standard 2D drafting primitives and annotations.
• Users commonly create straight-line geometry, curves/arcs, and rectangles.
• Dimensioning and text/alphanumeric labels are integral to documentation.

Concept / Approach:

Typical CAD “modes” or tools include Line, Polyline, Rectangle, Circle, Arc, Ellipse, along with constraints, snaps, and layers. Annotation modes include Dimension (linear, angular, radial) and Text for notes and callouts. Therefore, Line/Rectangle, Arc/Circle, and Dimension/Alphanumeric all represent authentic categories of CAD input interactions that work together to define and document designs.

Step-by-Step Solution:

Verification / Alternative check:

Major CAD platforms (for example, AutoCAD, DraftSight, Solid Edge 2D) all include these primitives and annotation tools as basic features.

Why Other Options Are Wrong:

Each individual pair is valid but incomplete; CAD workflows require a full set of geometry and annotation tools.

“None” is false because these modes are ubiquitous.

Common Pitfalls:

Neglecting layers and object snaps when drawing leads to poor alignment; always use snapping and constraints for accuracy.

Final Answer:

All of the above