Express the Complex Number in Polar Form $6 \mathrm { i }$

Multiple Choice

Express the complex number in polar form.
- $6 \mathrm { i }$

A) $6 \left( \cos 180 ^ { \circ } + i \sin 180 ^ { \circ } \right)$
B) $6 \left( \cos 270 ^ { \circ } + i \sin 270 ^ { \circ } \right)$
C) $6 \left( \cos 0 ^ { \circ } + i \sin 0 ^ { \circ } \right)$
D) $6 \left( \cos 90 ^ { \circ } + i \sin 90 ^ { \circ } \right)$