You configured a Fail-Safe Network (FSN) using two devices connected to two different switches.
What is an important issue to confirm with the customer’s switch configuration?

A.
If these are Cisco switches, theportfast capability must be disabled for each of the ports of the
FSN

B.
All the switch ports of the FSN must be configured to immediately switch from forwarding mode
to blocking mode and pass through spanning tree states

C.
All the switch ports of the FSN must be configured to immediately switch from blocking mode to
forwarding mode and not pass through spanning tree states

D.
All the switch ports of the FSN must be configured to immediately switch from forwarding mode
to blocking mode and not pass through spanning tree states