CAT 2021 Venn Diagrams — Previous Year Question

Given below is a diagram of three circles X, Y and Z which represent musicians, singers and dancers, respectively. The circles intersect with each other and form regions labelled a, b, c and d. (The three equal circles are arranged in a standard 3-circle Venn triangle layout: X top-left, Y top-right, Z bottom-center, all three pairwise overlapping with one common center region. Region d = X∩Y only, at the top between X and Y, not touching Z. Region b = X∩Y∩Z, at the center where all three overlap. Region a = X∩Z only, at the bottom-left. Region c = Y∩Z only, at the bottom-right.) Select the region that represents musicians who are singers but not dancers.