Which among the following formulae represents glycollic acid

$\mathrm{CH}_{3}-\mathrm{CH}(\mathrm{OH})-\mathrm{COOH}$
$\begin{array}{l} \mathrm{HOOC}-\mathrm{CH}_2-\mathrm{CH}_2- \mathrm{CH}-\mathrm{NH}_2 \\ \qquad \qquad \qquad \qquad \qquad ~~~ | \\ \qquad \qquad \qquad \qquad \qquad ~~ \mathrm{COOH} \end{array}$
$\begin{array}{l} \mathrm{HOOC}-\mathrm{CH}_2-\mathrm{CH}-\mathrm{NH}_2 \\ \qquad \qquad \qquad \quad ~~ | \\ \qquad \qquad \quad \qquad ~ \mathrm{COOH} \end{array}$
$\mathrm{HO}-\mathrm{CH}_{2}-\mathrm{COOH}$

Asked in: MHT CET 2020 (12 Oct Shift 2)