Which protocol should you enable on the EX Series switch to address this condition in the future?

A Layer 2 forwarding loop occurred on your network during a scheduled maintenance period.

You must prevent this behavior in the future.

Which protocol should you enable on the EX Series switch to address this condition in the future? (Choose two.)

A.
DVMRP

B.
L2TPv3

C.
STP

D.
RSVP