If $$\alpha $$ is the angle of crossing, then the number of crossings ‘N’ according to right angle method is given by

A. $$\frac{1}{2}\cot \left( {\frac{\alpha }{2}} \right)$$

B. $$\cot \left( {\frac{\alpha }{2}} \right)$$

C. $$\cot \left( \alpha \right)$$

D. $$\frac{1}{2}{\text{cosec}}\left( {\frac{\alpha }{2}} \right)$$

Answer: Option C