A certain sound contains the following frequencies: 400 Hz, 1600 Hz, and 2400 Hz. Select the best description of this sound View Available Hint(s) ▼ Hint 1. How to identify a fundamental within a series of frequencies a. This is a pure tone. b. This is a complex tone with a fundamental of 400 Hz, plus some of its overtones. c. This is a complex tone with a vrtual pitch of 800 Hz d. These frequencies are unrelated, so they are probably pure tones from three different sound sources.