Write the Number in I -Form $\frac { \sqrt { - 441 } } { \sqrt { - 9 } }$

Multiple Choice

Write the number in i -form. $\frac { \sqrt { - 441 } } { \sqrt { - 9 } }$

A) 9
B) 7
C) $- 9 i$
D) 7i
E) $7 + 9 i$