Which method of migrating from existing 2G and 3G mobile backhaul networks to 4G LTE is
recommended by Cisco best practices?

A.
Maintain existing 2G and 3G networks as is, and sunset them as the technology is no
longer needed.

B.
Drop 2G and 3G services and force a migration to all 4G LTE services and devices.

C.
Maintain existing 2G and 3G network access devices and migrate them to a unified
mobile backhaul network, taking advantage of an all IP backhaul network to support
pseudowires.

D.
Maintain existing 2G and 3G services while migrating the access devices to IP and using
the existing backhaul network to support the 4G services.

Explanation: