What does the first phase of the network two-phase commit protocol do?

A.
All participants are told to commit, thus guaranteeing the changes they make will survive a system
failure.

B.
All participants are told to commit in preparation for releasing locks.

C.
All participants are asked to prepare to commit, thus guaranteeing that the changes they make
will survive a system failure.

D.
All participants are instructed to release locks.