Mobile surveillance is often associated with which of the following?

Mobile surveillance is primarily connected with moving targets as it involves following and observing individuals or objects in motion rather than remaining in a fixed position. The essence of mobile surveillance is the ability to adapt to the subject's movements, whether they are pedestrians, vehicles, or other dynamic situations.

This type of surveillance can involve various techniques and equipment that allow law enforcement or investigative personnel to monitor the activities of these targets in real-time as they navigate through different environments. This can include the use of vehicles to follow suspects or utilizing technology that enables tracking.

Stationary locations, surveillance drones, and fixed cameras are more aligned with static observation techniques, where the focus is on monitoring specific areas or sites rather than actively tracking subjects that are in motion. Thus, the nature of mobile surveillance distinctly emphasizes the observation of moving targets, making it the correct association for this context.