You have a Brocade DCX running Fabric OS v7.0.1a and you need to perform a
non-disruptive upgrade to v7.2.0. You issue the firmwaredownload command from SSH but
are unable to upgrade. What would cause this problem?

A.
Fabric OS v7.2.0 is not supported on the Brocade DCX.

B.
You must upgrade to a 7.1 version of code first.

C.
A discontinued license is installed and needs to be removed first.

D.
The Brocade DCX needs to be disabled before starting the upgrade.

Explanation: