Two tuning forks have frequencies 380 and 384 Hz respectively. When they are sounded together, they produce 4 beats. After hearing the maximum sound, how long will it take to hear the minimum sound

• A

  $\frac{1}{2} \sec$

• B

  $\frac{1}{4} \sec$

• C

  $\frac{1}{8} \sec$

• D

  $\frac{1}{16} \sec$