The router SIS-R has been configured in a CIS network. As a network administrator, you were required to enable MPLS on that router. Which of the following description is making sense on the basis of the output information?
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A.
CEF switching is only needed to forward labeled packets.

B.
CEF switching is needed on both ingress and egress interfaces on which MPLS is enabled.

C.
Interface-level CEF switching is needed only on egress interfaces that are sending IP packets on which the egress LSR performs the label imposition
process.

D.
Interface-level CEF switching is needed only on ingress interfaces that are receiving IP packets on which the ingress LSR performs the label imposition
process.