What is the cause of this failure?

A customer is trying to boot an operating system that is installed on the eUSB on a Cisco UCS BSeries blade server; however, the boot fails. What is the cause of this failure?

A.
The local disk must be the first device in the boot order.

B.
eUSB is not a supported boot device.

C.
eUSB support is available only on the Cisco UCS C-Series rack server.

D.
eUSB is not the first device in the boot order for the server.