Find Real Numbers $a$ And $b$ Such That the Equation $a + b i = 4 - 9 i$

Multiple Choice

Find real numbers $a$ and $b$ such that the equation $a + b i = 4 - 9 i$ is true.

A) $a = - 4 , b = 9$
B) $a = 4 , b = 9$
C) $a = - 4 , b = - 9$
D) $a = 4 , b = - 9$
E) $a = 13 , b = - 5$