Which CBRN reconnaissance form relies on terrestrial vehicles?

The answer is correct because the mounted reconnaissance form utilizes terrestrial vehicles to conduct operations. This form of reconnaissance allows personnel to cover larger areas more quickly and effectively than dismounted operations, as terrestrial vehicles can navigate varied terrain while providing additional mobility and protection for the team. Mounted reconnaissance typically involves the use of specialized vehicles that are equipped with necessary monitoring and detection equipment to assess CBRN threats on the ground.

The other forms of reconnaissance serve different purposes: remote reconnaissance often involves the use of airborne drones or sensors to gather data from a distance without putting personnel in harm's way, dismounted reconnaissance involves personnel moving on foot to gather information and is generally used in situations where vehicles cannot go, and aerial reconnaissance is conducted using aircraft which may not provide the close-range, detailed assessments that mounted reconnaissance can achieve. Each has its unique application, but mounted reconnaissance specifically indicates the use of terrestrial vehicles for conducting operations.