The value of

 $$ cot41^\circ. cot42^\circ. cot43^\circ.co44. cot45^\circ.  cot46^\circ.cot47^\circ.cot48^\circ. cot49^\circ $$

A

0

B

1

C

$$\frac{\sqrt{3}}{2}$$

D

$$\frac{1}{\sqrt{2}}$$