The officer swings a red or yellow light, what does it require?

The officer swings a red or yellow light, what does it require?
A)To reduce speed.
B)To pass on the side corresponding to the arm with which the signal is made.
C)To stop the road users towards whom the light is directed.Correct
When a law enforcement officer swings a light, whether red or yellow, they are issuing a mandatory stop signal. This order is specifically directed at the road users towards whom the officer points the light. It is a stop signal that prevails over any other rule or signage.