[单选题]

F．or relation where primary key contains multiple attributes, no non-key attribute should be functionally dependent on a part of primary key. This relation R is at least in(66).
A．3NF
B．2NF
C．INF
D．BCNF

F．or relation where primary key contains multiple attributes, no non-key attribute should be functionally dependent on a part of primary key. This relation R is at least in(66).A．3NFB．2NFC．INFD．BCNF