Given are two tuning forks near one another. One of them is of unknown frequency and the other is of frequency 591 Hz.We can hear beat of maximum intensity `I_(0)`with frequency 5 Hz. At t = 0 we hear a maxima. Then
A. Unknown frequency can be 596 Hz
B. Unknown frequency can be 586 Hz
C. Intersity at time t = 2.7 s is /0
D. Intensity at time t = `(27)/(20)`s is` (0/2)`