If $\cot x = \large\frac{24}{7}$, then what is $\cos x$

Question

$\begin{array}{1 1} (a)\;\large\frac{7}{25} \\ (b)\;\large\frac{24}{25} \\ (c)\;\large\frac{25}{24} \\ (d)\;\large\frac{25}{7} \end{array}$