The correct answer is D. Fixed surveillance
Step-by-step explanation:
Surveillance involves the observation and monitoring of places, people, objects, etc. usually for the protection of these or to obtain information. Additionally, surveillance can occur in different ways, in the case of fixed surveillance this occurs when the officer or person surveilling is at a fixed point, this includes camouflaged location. Additionally, this differs from other types of surveillance because the observation and monitoring occurs from a fixed place. Thus, the surveillance described is fixed surveillance.