You need to ensure that the job step can run using a different user account

You administer a Microsoft SQL Server 2012 database.
You have a SQL Server Agent job instance that runs using the service account. You have a job step
within the job that requires elevated permissions.
You need to ensure that the job step can run using a different user account.
What should you use?

A.
A notification

B.
A schedule

C.
A job category

D.
A proxy