Which three commands can be used to harden a switch? (Choose three.)
A. switch(config)# spanning-tree bpdufilter default
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
G. switch(config)# service harden
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