Question: Which object ( s ) below has / have zero net torque? ( 1 ) . A planet orbiting around a star. ( 2 )

Which object(s) below has/have zero net torque?(1). A planet orbiting around a star.(2). A book supported at its center of gravity.(3). A disk spinning at increasing speed(4). An ice skater spinning faster and faster, but keeping thesame angular momentum, as she pulls her arms inward

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