In the Context of Types of Marketing Research Firms, External

In the context of types of marketing research firms, external research suppliers:

A) chosen by companies on a study-by-study basis help the companies gain greater flexibility.
B) strictly perform only selected aspects of marketing research.
C) are typically organizational units that reside within a company.
D) provide research method consistency unlike internal research providers.
E) are less objective in their approach and more subject to company politics and regulations than internal research providers.