Suppose that you have a the maintenance package identifies several possible field replaceable units (FRUs) that will resolve the problem. What should you do after turning the power off?

After turning off the power and if the maintenance package identifies several possible field replaceable units (FRUs) that will resolve the problem, you should:
Replace the indicated parts, one at a time in the recommended sequence, until the problem is resolved. This approach helps to systematically identify and address the faulty component without causing additional issues.
Return unused FRUs to stock ensures that unused replacement parts are not wasted and can be used for future repairs.
Option B suggests replacing all indicated FRUs at once, which might not be practical or efficient, especially if only one component is faulty.
Option C mentions replacing the system board first, which may not always be the correct approach and does not address the systematic replacement of components.
Therefore, the correct option is to replace the indicated parts one at a time until the problem is resolved and return unused FRUs to stock.