If the mid point of $AB$ is $(2,3)$ and point $B$ has coordinates $(8, 12)$, what are the coordinates of $A$ ?

Question

$\begin{array}{1 1} (a)\;(4,6) \\(b)\; (-4, -6)\\(c)\; (3,8)\\(d)\;(-3,-8) \end{array}$