Which one of the following is a valid combination of ports for an EtherChannel?
a. Two access links (one VLAN5, one VLAN 5)
b. Two access links (one VLAN1, one VLAN 10)
c. Two trunk links (one VLANs 1 to 10, one VLANs 1, 11,to 20)
d. Two Fast Ethernet links (both full duplex, one 10 Mbps)