What is the author's attitude towards two PR institutions: the in-house public relation department and external PR agency?
A.
The in-house public relation department is better because it knows the organization in a deeper way.
B.
It is just a personal preference since the two kinds don't have many differences.
C.
Each of them has its comparative advantages over the other.
D.
The external PR agency is better since it can improve efficiency with its professionalism.