Which of the following statements is TRUE of an occupation?

A$.$ An occupation is a group of unrelated jobs found in only one company.

B$.$ An occupation is a group of related duties found in only one company.

C$.$ An occupation is a group of jobs found at more than one company.

D$.$ An occupation is a group of unrelated tasks found in more than one company.

E$.$ An occupation is a group of jobs found in only one company.