Which of the following statement(s) is/ are true: a) A planet is a celestial body that orbits a star and may or may not be a star itself b) A planet has sufficient mass for self gravity and is roughly spherical in shape c) A planet is formed out of fragments of rock and metal leftovers in our solar system d) Pluto is the smallest planet of our solar system

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Which of the following statement(s) is/ are true: a) A planet is a celestial body that orbits a star and may or may not be a star itself b) A planet has sufficient mass for self gravity and is roughly spherical in shape c) A planet is formed out of fragments of rock and metal leftovers in our solar system d) Pluto is the smallest planet of our solar system