Cube roots of 8 cis(60°) are which of the following?

Cube roots of 8 cis(60°) are which of the following?

• A. 2[cos20°)+i sin20°], 2[cos140°)+i sin140°], 2[cos260°)+i sin260°]
• B. 2[cos60°+i sin60°], 2[cos180°+i sin180°], 2[cos300°+i sin300°]
• C. 2[cos20°+i sin20°], 2[cos40°+i sin40°], 2[cos60°+i sin60°]
• D. 2[cos-20°+i sin-20°], 2[cos100°+i sin100°], 2[cos260°+i sin260°]

Answer: (A)