If A={x:x2−1=0}A = \{x : x^2 - 1 = 0\}A={x:x2−1=0} and B={1}B = \{1\}B={1}, which of the following is true?
B⊂AB \subset AB⊂A
A⊂BA \subset BA⊂B
A=BA = BA=B
A∩B=∅A \cap B = \emptysetA∩B=∅