If A={1,2,3}A = \{1, 2, 3\}A={1,2,3} and B={3,4}B = \{3, 4\}B={3,4}, what is P(A)∩P(B)P(A) \cap P(B)P(A)∩P(B)?
{\emptyset, {3}}
{\emptyset, {1}, {3}}
{\emptyset, {3, 4}}
{\emptyset, {3}, {4}}