A solid cylinder rolls without slipping down a rough inclined plane without slipping as shown in figure. Choose the correct statement from the following.

A cylindrical rod of mass $M$, length $L$and radius $R$ has two cords wound around it whose ends are attached to the ceiling as shown. The rod is held horizontally with the two cords vertical. When the rod is released, cords unwind the rod rotates. Find tension in the cords as they unwind.

A solid sphere rolls without slipping on a rough horizontal surface under the action of a constant force $F$ applied as shown. The nature and direction of friction are

The rigid body is a thin circular wheel and the force is applied at the centre as shown in figure. The force of friction acting on the wheel is

A constant force $F$ has been applied upon the plank of mass $M$. Upon plank, a thin circular wheel of mass $\mathrm{m}$ and radius $R$ has been placed. There is no slipping between plank and wheel. The friction force upon wheel, will be