Express the Complex Number in Polar Form $7 \left( \cos 60 ^ { \circ } + i \sin 60 ^ { \circ } \right)$

Multiple Choice

Express the complex number in polar form.
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A) $7 \left( \cos 60 ^ { \circ } + i \sin 60 ^ { \circ } \right)$
B) $7 \left( \sin 60 ^ { \circ } + i \cos 60 ^ { \circ } \right)$
C) $7 \left( \cos 30 ^ { \circ } + i \sin 30 ^ { \circ } \right)$
D) $7 \left( \cos 60 ^ { \circ } + \sin 60 ^ { \circ } \right)$