c Serine is an amino acid its structure is $\begin{array}{*{20}{c}}
{HO - C{H_2} - CH - COOH} \\
{\,\,|} \\
{\,\,\,\,\,\,\,\,\,\,N{H_2}}
\end{array}$ As per exchange rule $L-$
serine is (figure)
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