Which three commands can be used to harden a switch? (Choose three.)
A . switch(config-if)# spanning-tree bpdufilter enable
B . switch(config)# ip dhcp snooping
C . switch(config)# errdisable recovery interval 900
D . switch(config-if)# spanning-tree guard root
E . switch(config-if)# spanning-tree bpduguard disable
F . switch(config-if)# no cdp enable
Answer: B,D,F