A 32-bit MPLS header consists of a 20-bit label used for packet forwarding, a 3-bit EXP field that identifies the IP packet priority, a 1-bit bottom-of-stack flag that
identifies the last label, and an 8- bit ITL field. Which statement about the ITL field is true?
A. It is used to prevent packet forwarding loops, similar to the TTL field in an IP header.
B. It is used for label management.
C. It specifies the upstream device in label distribution
D. It controls the LSR.