1.Which of the following statements is TRUE for a system comprising of two bodies in contact exerting frictional force on each other:Note: More than one option may be correct.a.Total work done by static friction on whole system is always zero.b.Work done by static friction on a body is always zero.c.Work done by kinetic friction on a body is always negative.d.Total work done by internal kinetic friction on whole system is always negative.Login to continueOnly logged in users canattempt or see the solution.