(D) Given that $\cos A = \frac{\sqrt{3}}{2}$.Since $\cos 30^{\circ} = \frac{\sqrt{3}}{2}$,we have $A = 30^{\circ}$.Now,we need to find the value of $\

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(D) Given that $\cos A = \frac{\sqrt{3}}{2}$.Since $\cos 30^{\circ} = \frac{\sqrt{3}}{2}$,we have $A = 30^{\circ}$.Now,we need to find the value of $\tan 3A$.Substituting $A = 30^{\circ}$,we get $\tan 3(30^{\circ}) = \tan 90^{\circ}$.Since $\tan 90^{\circ}$ is undefined,the value is $\infty$.