If P(A)=0.5,P(B)=0.2P(A)=0.5, P(B)=0.2P(A)=0.5,P(B)=0.2, and A,BA, BA,B are disjoint, what is P(Ac∩Bc)P(A^c \cap B^c)P(Ac∩Bc)?
0.3
0.7
0.1
0.9