Three forces \( 4 \mathrm{~N}, 3 \mathrm{~N} \) and 6 N act at a point in the direction parallel to the sides \( \mathrm{AB}, \mathrm{BC} \) and CA of an equilateral triangle \( A B C \) respectively. Find their resultant.

A \( \sqrt{7} \mathrm{~N} \)

B \( \sqrt{6} N \)

C \( \sqrt{5} \mathrm{~N} \)