Which option would you use on a SPARC system to boot to the currentBE boot environment?

You have installed software updates to a new boot environment (BE) and have activated that the
booting to the new BE, you notice system errors. You want to boot to the last known good
configuration.
Which option would you use on a SPARC system to boot to the currentBE boot environment?

A.
boot –L currentBE

B.
boot –Z rpool/ROOT/currentBE

C.
boot –a Enter the currentBE dataset name when prompted.

D.
boot rpool/ROOT/currentBE

E.
boot –m currentBE

F.
beadm activate currentBE

Explanation:
You can change an inactive boot environment into an active boot environment. Only
one boot environment can be active at a time. The newly activated boot environment becomes the
default environment upon reboot.
How to Activate an Existing Boot Environment
1. Use the following command to activate an existing, inactive boot environment:
beadm activate beName
beName is a variable for the name of the boot environment to be activated.
Note the following specifications.
beadm activate beName activates a boot environment by setting the bootable pool property,
bootfs, to the value of the ROOT dataset of the boot environment that is being activated.
beadm activate sets the newly activated boot environment as the default in the menu.lst file.
2. Reboot.
The newly activated boot environment is now the default on the x86 GRUB menu or SPARC boot
menu.
Reference: Changing the Default Boot Environment
Booting a Solaris System