The Fischer projection of $D$-erythrose is shown below :\ $D$-Erythrose and its isomers are listed

Question

The Fischer projection of $D$-erythrose is shown below :\ $D$-Erythrose and its isomers are listed as $P, Q, R$ and $S$ in Column-I. Choose the correct relationship of $P, Q, R$ and $S$ with $D$-erythrose from Column-II.

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(c) :\