The values of \( \mathrm{k} \) for which the quadratic equation \( 16 x^{2}+4 k x+9=0 \) has rea...

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The values of \( \mathrm{k} \) for which the quadratic equation \( 16 x^{2}+4 k x+9=0 \) has real and equal roots are
D.
(a) \( 6,-\frac{1}{6} \)
(b) \( 36,-36 \)
(c) \( 6,-6 \)
(d) \( \frac{3}{4},-\frac{3}{4} \).
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