What Is the Major Difference Between Review Articles and Articles

What is the major difference between review articles and articles that report original empirical studies

A)  Review articles summarize findings from a large number of studies on a specific topic, whereas most empirical articles are more limited in scope. 
B)  Review articles are published in books while empirical articles are published in journals. 
C)  Review articles are used to evaluate new techniques, whereas empirical articles report new research results. 
D)  Review articles are reviewed by experts before they are published in the journal, unlike most empirical articles.