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Find the odd one in the following group

$Q,W,Z,B \qquad B,H,K,M \qquad W,C,G,J \qquad M,S,V,X$

1. $Q, W, Z, B$
2. $B,H,K,M$
3. $W,C,G,J$
4. $M,S,V,X$