Which command can you rely upon to get you to a good known state…?

When upgrading to Oracle Solaris 11 from Oracle Solaris 11 Express or Oracle Solaris 11
Early Adopter, the progress suddenly fails. Which command can you rely upon to get you to
a good known state where you can still boot the Oracle Solaris 11 Express or Oracle Snarls
11 Early Adopter images, as they were, prior to your upgrade attempt?

A.
ifconfig

B.
pkg