Refer to the exhibit. A network engineer received a sudden request to prioritize voice over his Cisco network and he has decided to leverage the AutoQoS feature. Based on the output shown, which two tasks need to be performed prior to issuing the autoqos voip command in this router? （）

• A、Enable Cisco Express Forwarding.
• B、Enable fast switching.
• C、Delete all policy maps.
• D、Remove service-policy commands from interface serial1/0.
• E、Delete all the currently configured class maps.