Which interface must the administrator select in the static route device drop-down list?

An administrator would like to create an SD-WAN default static route for a newly created SD-WAN using the FortiManager GUI. Both port1 and port2 are part of the SD-WAN member interfaces.

Which interface must the administrator select in the static route device drop-down list?
A . port2
B . virtual-wan-link
C . port1
D . auto-discovery

Answer: B