Examine the following options，which Spanning Tree Protocol （STP） protection mechanism disables aswitch port if the port receives a Bridge Protocol Data Unit （BPDU）？（）

A.BPA attack
B.Adaptive chosen ciphertext attack
C.DDoS attack
D.Man-in-the-middle attack

A.takes a snapshot of the router running configuration and securely archives it in persistent storage
B.stores a secured copy of the Cisco IOS image in its persistent storage
C.backs up the Cisco IOS image from flash to a TFTP server
D.enables Cisco IOS image resilience