which command do you enter to troubleshoot a misconfigured EtherChannel ?

which command do you enter to troubleshoot a misconfigured EtherChannel ?
A . CORE-SW (config)#spanning-tree etherchannel guard misconfig
B . CORE-SW (config-if)#spanning-tree etherchannel guard misconfig
C . CORE-SW (config)# spanning-tree etherchannel misconfig guard
D . CORE-SW (config-if)# spanning-tree etherchannel misconfig guard

Answer: A