Given that $y=A \sin \left[\left(\frac{2 \pi}{\lambda}(c t-x)\right)\right]$, where $y$ and $x$ are measured in metre. Which of the following statements is true?

• Correct answer
  A

  The unit of $\lambda$ is same as that of $x$ and $A$
• B

  The unit of $\lambda$ is same as that of $x$ but not of $A$
• C

  The unit of $c$ is same as that of $\frac{2 \pi}{\lambda}$
• D

  The unit of $(c t-x)$ is same as that of $\frac{2 \pi}{\lambda}$

Hence, the correct answer is option: 'A'.