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Use a Pythagorean Trigonometric Identity to find the exact value of:

$$\cos\left[\sin^{-1}\left(-\cfrac{\sqrt3}{4}\right)\right]$$

A

$\cfrac{\sqrt{19}}{4}$

B

$-\cfrac{\sqrt{19}}{4}$

C

$\cfrac{\sqrt{13}}{4}$

D

$-\cfrac{\sqrt{13}}{4}$

E

$\cfrac{\sqrt{7}}{4}$

F

$-\cfrac{\sqrt{7}}{4}$

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