A.switch(config-if)#switchport mode trunk switch(config-if)#switchport port-security maximum 1
B.switch(config-if)#switchport mode trunk switch(config-if)#switchport port-security mac-address 1
C.switch(config-if)#switchport mode access switch(config-if)#switchport port-security maximum 1
D.switch(config-if)#switchport mode access switch(config-if)#switchport port-security mac-address 1