Which of the Following Arrangements Would Qualify as Job Rotation

Which of the following arrangements would qualify as job rotation?

A) A receptionist hired to perform the jobs of file clerk and typist
B) Training support staff in front office functions through periods of alternating work arrangements
C) Members of the production team making decisions regarding how to resolve problems with customers
D) A manager participating in a meeting while on vacation with his family
E) A manager directing employees to stop production when quality standards are not met