[单选题]
Two objects of mass M and m are connected via a frictionless pulley. The rope attached to the object of mass M makes an angle $\theta$ with the horizontal. The objects are at rest. For the large mass, which expressions are correct for the force of friction $F_f$ and the normal force N
What is $F_f$ and what is N
A. mg$\cos \theta$ Mg-mg$sin \theta$
B. mg$\sin \theta$ Mg-mg$sin \theta$
C. mg$\sin \theta$ Mg-mg$cos \theta$
D. mg$\cos \theta$ Mg-mg$cos \theta$
