Why the network administrator is unable to send packets with a size of 1501 bytes after increasing the router interface MTU to 1600 bytes?

A.
The branch router cannot process frames larger than 1500 bytes.

B.
The router at the other end of the WAN link is configured with an MTU of 1500.

C.
The frames take too long to send causing collisions with other devices attempting to send traffic.

D.
The WAN link does not support frames over 1500 bytes in size.