The equation for the calculation of torque transmitting capacity in the conical clutch as per uniform pressure theory is ________.

A

$$M_t = \frac{\mu P}{3 \sin \alpha}\frac{D^3 - d^3}{D^2 + d^2}$$

B

$$M_t = \frac{\mu P}{3 \sin \alpha}\frac{D^3 + d^3}{D^2 - d^2}$$

C

$$M_t = \frac{\mu P}{3 \sin \alpha}\frac{D^3 - d^3}{D^2 - d^2}$$

D

$$M_t = \frac{\mu P}{3 \sin \alpha}\frac{D^2 - d^2}{D^3 - d^3}$$