Implementing Cisco IP Switched Networks (SWITCH v2-0) (#357)

Which statement about the configuration of a trunk port as the source of a SPAN session is true?

Only VLANs that are configured individually as SPAN sources are monitored.
All VLANs in the trunk are monitored.
The trunk is errdisabled automatically.
All VLANs in the trunk are monitored, provided the SPAN destination port is a trunk.