If $f(x)=\tan \left(\frac{\pi}{\sqrt{x+1}+4}\right)$ is a real valued function then the range of $f$ is

• A

  $[-1,1]$
• Correct answer
  B

  $(0,1]$
• C

  $[-1, \infty)$
• D

  $\mathbb{R}$

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