If `n_(1), n_(2 ) "and" n_(3)` are the fundamental frequencies of three segments into which a string is divided, then the original fundamental frequency n of the string is given by

Options

A. ` n = n_(1) + n_(2) + n_(3)`
B. `(1)/(n) = (1)/(n_(1)) + (1)/(n_(2)) + (1)/(n_(3))`
C. `(1)/(sqrtn) = (1)/(sqrtn_(1)) + (1)/(sqrtn_(2)) + (1)/(sqrtn_(3))`
D. `sqrtn = sqrt(n_(1)) + sqrt(n_(2)) + sqrt(n_(3))`