Which of the following descriptions regarding the TTL field of the IP packet is correct?

Which of the following descriptions regarding the TTL field of the IP packet is correct?

A. The TTL defines how many packets the source can send. B. The TTL defines the duration during which the source can send packets. C. The TTL value will decrement by 1 each time the packet is routed. D. The TTL value will increment by 1 each time the packet is routed.