What is the role of communication protocols in climbing, and which vocal commands are commonly used?

• A. Slow climbers for safety; commands are optional and rarely used.
• B. Ensures coordination and safety; common calls include On belay, Belay on, Climbing, Take, Slack, Lower, Rope.
• C. Used to record ascent in logbooks; commands include Record and Reset.
• D. Only used during rescue scenarios; commands include Stop and Go.

Answer: (B)