【单选题】
Refer to the exhibit. The show mpls interfaces detail command has been used to display information about the interfaces on router R1 that have been configured for label switching. Which statement is true about the MPLS edge router R1?（）<img src="https://nimg.ppkao.com/2018-07/lina/2018072411495589187.jpg?sign=839735a5aa6f058d58d010d03ef81708&t=62d47a47" />
A、Packets can be labeled and forwarded out interface Fa0/1 because of the MPLS operational status of the interface.
B、Because LSP tunnel labeling has not been enabled on interface Fa0/1， packets cannot be labeled and forwarded out interface Fa0/1.
C、Packets can be labeled and forwarded out interface Fa1/1 because MPLS has been enabled on this interface.
D、Because the MTU size is increased above the size limit， packets cannot be labeled and forwarded out interface Fa1/1.
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