When you verify a fix, you determine that the problem could have been prevented. What should you do to help the user avoid having the same problem again?

a$.$

Document the problem and hope the user reads your notes.

b$.$

Instruct the user on how to prevent the problem.

c$.$

Don't tell the user anything so that he will have to call you back when the problem occurs again.

d$.$

Lock the user out of the problem area.