Why have unmanned aerial vehicles, or drones, proved to be effective in assisting Customs and Border Enforcement agents with securing our borders? Select all that apply.

$$ UAVs are capable of surveillance over large stretches of border that are relatively inaccessible to agents in vehicles.

$$ UAVs can be equipped with night vision cameras and thermal imaging devices that can identify the movement of people and contraband across the border in the middle of the night.

$$ UAVs are so inexpensive they can be deployed along both borders for less than the salary of a border patrol officer.

$$ UAVs can be flown in any kind of weather and rarely, if ever, need maintenance.