Refer to the exhibit. An administrator is attempting to configure a router by copying and pasting the commands that are shown in the exhibit. However, only one of the FastEthernet interfaces is coming up. What is the problem?

Refer to the exhibit. An administrator is attempting to configure a router by copying and pasting the commands that are shown in the exhibit. However, only one of the FastEthernet interfaces is coming up. What is the problem?

Both interfaces are in the same IP subnet.
FastEthernet0/1 does not have a description.
There can be only one FastEthernet interface enabled on a router at one time.

The administrator did not exit to global configuration mode before configuring FastEthernet0/1.