$A$ stretched string is fixed at both ends. It is made to vibrate so that the total number of nodes formed in it is '$x$'. The length of the string in terms of the wavelength of waves formed in it is $(\lambda = \text{wavelength})$

• A
  $\frac{x \lambda}{2}$
• B
  $\left(x+\frac{1}{2}\right) \frac{\lambda}{2}$
• C
  $(x-1) \frac{\lambda}{2}$
• D
  $(x+1) \frac{\lambda}{2}$