Which list defines the contents of an MPLS label?

Which list defines the contents of an MPLS label?
A . 20-bit label; 3-bit traffic class; 1-bit bottom stack; 8-bit TTL
B . 32-bit label; 3-bit traffic class; 1-bit bottom stack; 8-bit TTL
C . 20-bit label; 3-bit flow label; 1-bit bottom stack; 8-bit hop limit
D . 32-bit label; 3-bit flow label; 1-bit bottom stack; 8-bit hop limit

View Answer

Answer: A

Explanation:

Reference: https://tools.ietf.org/html/rfc5462