What should the administrator do to add the new 5400R switch?

A company has an Aruba 5400R switch, switch 1, at the network core of its campus. This switch routes all traffic for the campus and is the RSTP root. The company now wants to add another Aruba 5400R switch to the core in order to enhance resiliency. The company wants to use the option that provides the best Layer 2 and Layer 3 resiliency and also the simplest setup.

What should the administrator do to add the new 5400R switch?
A . Add the new switch and migrate to MSTP with two instances.
B . Add the new switch and set up OSPF on all switches.
C . Add the new switch as a secondary root bridge in RST
E . Add the new switch as a standby member in a VSF fabric with switch 1.

Answer: C