Which action must be done to apply a new load balancing…

A network engineer must set the load balance method on an existing port channel. Which action must be done to apply a new load balancing method?

A.
Configure the new load balancing method using port-channel load-balance.

B.
Adjust the switch SDM back to “default”.

C.
Ensure that IP CEF is enabled globally to support all load balancing methods.

D.
Upgrade the PFC to support the latest load balancing methods.

Explanation:
Example:
EtherChannel balances the traffic load across the links in a channel through the reduction of part of the binary pattern that the addresses in the frame form to a
numerical value that selects one of the links in the channel. EtherChannel load balancing can use MAC addresses or IP addresses, source or destination

addresses, or both source and destination addresses. The mode applies to all EtherChannels that are configured on the switch. You configure the load balancing
and forwarding method with use of the port-channel load-balance {dst-ip | dst-mac | src-dst-ip | src-dst-mac | src-ip | src-mac} global configuration command.
http://www.cisco.com/c/en/us/support/docs/lan-switching/etherchannel/12023-4.html