Final answer:
A Controlled Access Zone is a designated work area where certain types of work can take place without conventional fall protection systems.
Step-by-step explanation:
The correct answer is b. Controlled Access Zone. A Controlled Access Zone is a work area designated and clearly marked in which certain types of work may take place without the use of conventional fall protection systems to protect workers. It is a restricted area that is isolated from residences or other areas where the general public may be present.