Which two statements about configuring an Ether Channel on a Cisco switch are true? (Choose two)

Which two statements about configuring an Ether Channel on a Cisco switch are true? (Choose two)
A . The interfaces configured in the Ether Channel must have the same STP port path cost
B . The interfaces configured in the Ether Channel must be on the same physical switch
C . An Ether Channel can operate in Layer 2 mode only
D . The interfaces configured in the Ether Channel must operate at the same speed and duplex mode
E . The interfaces configured in the Ether Channel must be part of the same VLAN or trunk

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Answer: BD