C-02-Q051mediumsingle_mcqA−BA - BA−B is defined as—a{x:x∈A\{x : x \in A{x:x∈A and x∈B}x \in B\}x∈B}b{x:x∈A\{x : x \in A{x:x∈A and x∉B}x \notin B\}x∈/B}c{x:x∈B\{x : x \in B{x:x∈B and x∉A}x \notin A\}x∈/A}d{x:x∈A\{x : x \in A{x:x∈A or x∈B}x \in B\}x∈B}