Which of the following statements is true?

Question $49$ options:

a$)$

Staff departments include all of those that provide specialized skills in support of line departments.

b$)$

Line departments include all of those that provide specialized skills in support of staff departments.

c$)$

Line departments include all of those that provide specialized skills in support of functional departments.

d$)$

Functional departments include all of those that provide specialized skills in support of primary departments.

e$)$

Primary departments include all of those that provide specialized skills in support of functional departments.