How Do Bilateral Kinship Systems Differ from Other Kinship Systems

How do bilateral kinship systems differ from other kinship systems?

A) Unlike in cognatic systems, bilateral descent is traced through either gender.
B) Unlike in cognatic systems, bilateral kinship is only traced through a single gender.
C) Unlike both cognatic and unilineal systems, bilateral systems have no large, property holding groups.
D) Unlike unilineal systems, bilateral systems trace descent only through a single gender.