Which of the following router types has to perform an IP routing table lookup when forwarding a packet over an MPLS network if PHP is active?

Which of the following router types has to perform an IP routing table lookup when forwarding a packet over an MPLS network if PHP is active?

A.
Egress PE router

B.
P router

C.
Penultimate P router

D.
CE router

Explanation:

It is certain that option A (Egress PE router) needs to perform an IP lookup, but CE router, being the receiver does not apply (not D).