What is the percentage of ionic character of HCl.If $\mu=1.02D$, bond length is $1.275\overset{\circ}{A}$ ($e=4.8\times 10^{-10}$e.s.u)?

Question

$\begin{array}{1 1}(a)\;\text{100% ionic}&(b)\;\text{17% ionic}\\(c)\;\text{83% ionic}&(d)\;\text{0% ionic}\end{array}$