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The Ryerson University Library is organized in a hierarchy with six unit heads reporting to a chief librarian.

The units are archives, audiovisual$/$interlibrary loans, library access services, reference and information, systems, and technical services. Within these units are $15$ librarians and $47$ full$-$time library staff. One tool used in the organizational development of the library was to systematically move employees from one job to another to give them an opportunity to learn and use different skills. Which of the following was the Ryerson University Library using?

a$)$ job specialization

b$)$ job enlargement

c$)$ task aggregation

$$ d$)$ job rotation