EtherChannel bundles can consist of up to eight physical ports of the same Ethernet
media type and speed. Some configuration restrictions exist to ensure that only similarly
configured links are bundled.
Generally, all bundled ports first must belong to the same VLAN. If used as a trunk,
bundled ports must be in trunking mode, have the same native VLAN, and pass the
same set of VLANs. Each of the ports should have the same speed and duplex settings
before being bundled. Bundled ports also must be configured with identical spanningtree
settings. (From Cisco Official Cert Guide). I think A-E are the corrects.
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