Luminosity class indicators use Roman numerals; which class indicates a supergiant?

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Multiple Choice

Luminosity class indicators use Roman numerals; which class indicates a supergiant?

Explanation:
Luminosity class tells how large and luminous a star is for its temperature, and it's written with Roman numerals. The system goes I for supergiants, II for bright giants, III for giants, IV for subgiants, and V for main-sequence dwarfs. Supergiants are the largest and most luminous, so the designation I identifies them. The other classes describe smaller or less luminous stages, like main-sequence stars, giants, and bright giants. So the class that indicates a supergiant is the one labeled with I.

Luminosity class tells how large and luminous a star is for its temperature, and it's written with Roman numerals. The system goes I for supergiants, II for bright giants, III for giants, IV for subgiants, and V for main-sequence dwarfs. Supergiants are the largest and most luminous, so the designation I identifies them. The other classes describe smaller or less luminous stages, like main-sequence stars, giants, and bright giants. So the class that indicates a supergiant is the one labeled with I.

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