What condition would result in this behavior?

— Exhibit –-

— Exhibit —
An administrator is deploying a distributed router and is adding an interface for a logical switch, as
shown in the following exhibit:
The administrator clicks on the Change link to specify the network to connect to. Selecting the
distributed portgroup, the administrator finds that no portgroups are listed. The administrator
verifies the desired portgroup exists in vCenter Server.
What condition would result in this behavior?

A.
The MTU size is set to 1500

B.
A subnet has not been configured

C.
The interface name has an invalid character

D.
The interface type is incorrect