Civil 3D alignments have four types of tables. Which of the following is the fourth type that completes the set?

• A. Segment
• B. Arc
• C. Line
• D. Curve

Answer: (A)

Civil 3D alignments are described using separate tables for the different primitive geometry pieces that make up the alignment. Each type of geometry—straight pieces, curves, and transitions—has its own table so you can review or edit that part of the alignment in isolation. The straight portions are captured in the segment table, which records the linear pieces between vertices and curves. This completes the set alongside the tables for arcs (circular curves) and other curve or transition types. So the segment table is the missing fourth type, representing the straight-line portions of the alignment.