In the figure $O$ is the centre of a circle of radius 5 cm. T is a point such that OT = 13 cm and OT intersects the circle at E. If AB is the tangent to the circle at E, then the length of AB is _________

Question

$\begin{array}{1 1} (a)\;20\;cm\\ (b)\;10\;cm \\(c)\;\frac{20}{3}\;cm \\ (d)\;\frac{10}{3} \;cm \end{array}$