If $\lambda_r$,$\lambda_v$,and $\lambda_x$ are the wavelengths of red light,violet light,and $X$-rays respectively,then which of the following relations is correct?

• A
  $\lambda_r > \lambda_v > \lambda_x$
• B
  $\lambda_x > \lambda_v > \lambda_r$
• C
  $\lambda_v > \lambda_r > \lambda_x$
• D
  None of these