Find the discriminant of the following quadratic equation and hence determine the nature of the roots of the equation: $x^{2} = 9$.
- ADiscriminant = $36$,Roots are real,rational,and distinct.
- BDiscriminant = $0$,Roots are real and equal.
- CDiscriminant = $-36$,Roots are imaginary.
- DDiscriminant = $9$,Roots are real and distinct.
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