Which of the following is true about the MPLS header and its EXP field size?()
- AThe MPLS header is 2 bytes,and the EXP field is 3 bits long.
- BThe MPLS header is 1 byte,and the EXP field is 3 bits long.
- CThe MPLS header is 4 bytes,and the EXP field is 3 bits long.
- DThe MPLS header is 3 bytes,and the EXP field is 3 bits long.