The controls that usually require a human to evaluate the input from sensors or cameras to determine if a real threat exists are associated with: 

Answer options:

A. Preventive/physical
B. Detective/technical
C. Detective/physical
D. Detective/administrative

C

Detective/physical controls usually require a human to evaluate the input from sensors or cameras to determine if a real threat exists. Source: KRUTZ, Ronald L. & VINES, Russel
D., The CISSP Prep Guide: Mastering the Ten Domains of Computer Security, 2001, John Wiley & Sons, Page 36.