When a stretched string of length `L` vibrating in a particular mode, the distance between two nodes on the string is `l`. The sound produced in this mode of vibration constitutes the `nth` overtone of the fundamental frequency of the string.
A. `L=(n+1)l`
B. `L-(n-1)l`
C. `L=nl`
D. `L=(n+1//2)l`