Which behaviors may indicate a potential threat?

C is the correct answer because suspicious movements, loitering, or attempts to access restricted areas are common behaviors that can indicate a potential threat in security contexts. Security personnel are trained to be vigilant about unusual activities in their environment, as these behaviors can signal that someone may have harmful intentions or may be planning something illegal. Recognizing and assessing such behavior is critical to maintaining safety and security in a given area.

In contrast, friendly conversations with staff, regular cleaning and maintenance, and following security protocols are all behaviors that typically contribute to a safe and secure environment. Friendly interactions can foster a positive atmosphere and rapport among employees, while regular cleaning and maintenance are essential for ensuring overall workplace safety and functionality. Following established security protocols further enhances safety by providing a systematic approach to handling various situations, thereby making it less likely for them to represent any threat.