If AAA and BBB are events with P(A)=0.4P(A) = 0.4P(A)=0.4, P(B)=0.3P(B) = 0.3P(B)=0.3, and P(A∪B)=0.6P(A \cup B) = 0.6P(A∪B)=0.6, what is P(Ac∣Bc)P(A^c | B^c)P(Ac∣Bc)?
0.500.500.50
0.570.570.57
0.600.600.60
0.400.400.40