A planet moves in an elliptical orbit with sun at one of its focii <br> 1) In path QRP work done by gravity is positive . <br> 2) In path PSQ work done by gravity is negative . <br> 3) Linear velocity of rotation from Q to P via R decreases. <br> 4) Gravitational potential energy increases in going from P to Q via R

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a) 1,2 and 3 are correct b) 1,2 and 4 are correct c) 2,3,4 are correct d) 1,2,4 are correct