Most people have at least five years of experience in an office before becoming:

a. managers.

b. subject-matter experts.

c. virtual assistants

To become a Manager one must have at least five years of experience.

Explanation:

Subject-matter expert:

Any person who has completed UG or PG can become subject-matter expert. Only thing the knowledge in a particular subject will be assessed during the various interview process. This is enough to become a SME

Virtual assistant:

He / she is the person who supports business form remote location This role will be either bottom most or middle position role depending on the organization's hierarchy.

Manager:

Whereas manager has huge responsibility It requires lots of experience to handle people, business, understand organizational goal, meet requirement, achieve targets, multi-tasking, etc. So it needs both skill and experience to become a manager and it cannot happen suddenly.