In Traffic Policing, Dual Buckets at Dual Rates Are Used

In traffic policing, dual buckets at dual rates are used. The number of tokens in bucket C is TC, and the number of tokens in bucket P is TP. When a packet with a length of B is received, which of the following statements are true?

A) If (TP-B) and (TC-B) are larger than 0, the packet is marked green
B) If (TP-B) is larger than 0 and (TC-B) is smaller than 0, the packet is marked yellow
C) If (TP-B) is larger than 0 and (TC-B) is smaller than 0, the packet is marked green
D) If (TP-B) and (TC-B) are smaller than 0, the packet is marked red