How Are Fluorescent Decals Used to Increase the Risk of Apprehension

How are fluorescent decals used to increase the risk of apprehension of a car thief?

A) The decals emit microwave signals, enabling the vehicle to be tracked.
B) Studies show bright decals that read "this car is equipped with an alarm" deter car thieves.
C) They indicate what time periods the car is not used so if spotted during this period police know it is stolen.
D) If driven off a parking lot, the decal triggers a closed-circuit camera, which films the offence as it is happening.