An ISP has an IP/MPLS core network. Recently, after replacing low-capacity routers with two
Cisco Carrier Routing System routers, customer has complained about reduced application
performance (slow website access). What is the most likely cause for this issue?

A.
After the two CRS-1s are inserted, other low-capacity routers are not up to the forwarding
performance of CRS.

B.
The addition of two CRS-1 routers has caused increased queuing latency.

C.
Packet forwarding on the CRS-1s are processed by the RP CPU.

D.
The policer used by LPTS on CRS-1s is dropping some traffic.

E.
The default interface MTU setting of 1500 bytes on the CRS-1s is causing MPLS packet
fragmentation.