Implementing Cisco IP Switched Networks (SWITCH v2-0) (#20)

An access switch has been configured with an EtherChannel port. After configuring SPAN to monitor this port, the network administrator notices that not all traffic is being replicated to the management server. What is a cause for this issue?

VLAN filters are required to ensure traffic mirrors effectively.
SPAN encapsulation replication must be enabled to capture EtherChannel destination traffic.
The port channel can be used as a SPAN source, but not a destination.
RSPAN must be used to capture EtherChannel bidirectional traffic.