Which technologies should the architect recommend?

Refer to the exhibit.

A customer needs a network upgrade.

The customer has these availability requirements for wireless access:

– One MC and one core switch can fail with immediate, stateful failover for client connections.

– Network upgrades can occur without the requirement of a maintenance window.

The exhibit shows the architecture plan.

Which technologies should the architect recommend?
A . Clustering on MCs and VRRP on Core switches
B . VRRP on MCs and VSF on Core switches
C . VRRP on both MCs and Core switches
D . Clustering on MCs and VSF on Core switches