In the figure, a body A of mass m slides on plane inclined at angle `theta_1` to the horizontal and `mu_1` is the coefficient of friction between A and the plane. A is connected by a light string passing over a fictionless pulley to another body B, also of mass m, sliding on a frictionless plane inclined at angle `theta_2` to the horizontal which of the following statements are true ?

Options

A. A will never move up the plane.
B. A will just start moving up the plane when `mu = frac(sintheta_2 - sintheta_1)(costheta_1)`
C. For A to move up the plane, `theta_2` must always be greater than `theta_1`.
D. B will always slide down with constant speed.