A 4kg block rests on a rough horizontal table. A horizontal force of 10N is applied to the right, yet the block does not move. Which statement about the frictional force acting on the block is correct?
a) It acts to the left with magnitude μsR.
b) It acts to the right with magnitude 10N.
c) It acts to the left with magnitude 10N.
d) It acts to the right and equals μsR.