You are given four tuning forks.The fork with the lowest frequency oscillates at 500 Hz. By striking two tuning forks at a time, you can produce the following beat frequencies, 1, 2, 3, 5, 7, and 8 Hz. What are the possible frequencies of the other three forks?

(1) 301, 302 & 307.

(2) 301, 303 & 308.

(3) 300, 304 & 307.

(4) 305, 307 & 308.