At what maximum speed does the ADAS system "Rear Cross Traffic Alert or RCTA" intervene in the vehicle's brakes?

A)At a speed below 30 km/h.
B)At a speed below 50 km/h.
C)At a speed below 15 km/h.Correct
RCTA. Rear Cross Traffic Alert: The system monitors rear cross traffic when reversing out of a perpendicular parking space. If it detects an approaching vehicle, an audible and/or visual warning will be issued.
Some manufacturers, if the driver does not react to the warning, will intervene in the brakes with maximum force in the event of an imminent collision, provided the vehicle is travelling at a speed below 15 km/h.