The equation $\tan ^4 x-2 \sec ^2 x+a^2=0$ will have at least one real solution if

• A

  $|a| \leq 4$
• B

  $|a| \leq 2$
• Correct answer
  C

  $|a| \leq \sqrt{3}$
• D

  None of the above

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