Write the Complex Number in Rectangular Form $\sqrt { 7 } \operatorname { cis } 270 ^ { \circ }$

Multiple Choice

Write the complex number in rectangular form.
- $\sqrt { 7 } \operatorname { cis } 270 ^ { \circ }$

A) $- \mathrm { i } \sqrt { 7 }$
B) $- \mathrm { i }$
C) $- 7 \mathrm { i }$
D) $- \sqrt { 7 }$