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The answer is D. Mass, brightness and size are used to measure the physical properties of the stars. One is the brightness it is a combination of the intrinsic brightness of a star. Second is the  size is calculated using the Stephan's Law. And the third is the mass, astronomers use the Stellar mass to describe the mass of the stars.

Answer: Option 'D' is correct.

Explanation:

Physical features of stars are temperature, size, color, brightness, mass.

All are used to measure star.

Basically star is chemical composition which consists brightness, color , mass, size etc.

Hence, Option 'D' is correct.

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