Multiply and Then, If Possible, Simplify by Factoring $\sqrt{\mathrm{x}-3} \sqrt{\mathrm{x}-3}$ A) $\sqrt{x^{2}+9}$

Multiple Choice

Multiply and then, if possible, simplify by factoring.
- $\sqrt{\mathrm{x}-3} \sqrt{\mathrm{x}-3}$

A) $\sqrt{x^{2}+9}$
B) $\sqrt{\mathrm{x}-3}$
C) $x^{2}-6 x+9$
D) $x-3$