At boot, a SPARC-based system reports this error:
ok boot
Rebooting with command: bootBoot device: disk02 File and args: Evaluating: boot Can’t open boot device
ok
To address the problem, you need to reset the boot device parameter to its default value. There are other variables that need to retain their current values.
Which command achieves this?

A.
set-default boot-device=default

B.
set-default boot-device

C.
set-defaults

D.
boot-device=disk net