What can happen if a P router (LSR) within an LSP performs route summarization and suppresses the more specific networks?

A.
Route summarization will cause every LSR along the LSP to perform a routing lookup.

B.
Route summarization will help reduce the size of the LIB and LFIB and will not affect MPLS label switching operations.

C.
Route summarization will cause the P router (LSR) that performs the route summarization to perform PHP (penultimate-hop popping).

D.
Route summarization will break an LSP into two segments, and the P router (LSR) that performs the route summarization will need to perform a routing lookup.