Perform the Operation and Write the Result in Standard Form $\sqrt { - 28 } + \sqrt { - 112 }$

Multiple Choice

Perform the operation and write the result in standard form. $\sqrt { - 28 } + \sqrt { - 112 }$

A) $9 i \sqrt { 7 }$
B) $\sqrt { 11 } i \sqrt { 7 }$
C) $- 5 i \sqrt { 7 }$
D) $6 i \sqrt { 7 }$
E) $- 2 i \sqrt { 7 }$