设随机事件$A,B$满足$P(A)=P(B)=0.5,P(A\cup B)=1$,则(）.
A $A\cup B=\Omega$
B $AB=\emptyset$
C $P(\overline{A}\cup\overline{B})=1$
D $P(A-B)=0$
(A)P(overline(AB))=0; (B)P(AB)=P(A.)P(B.); (C.)P(A)=1-P(B); (D.)P(overline(A)c
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