Which of the following statements are correct? 0, 1, or more than 1 answers may apply* The height of a wave is called its amplitude. The length of a wave is called its frequency. To send multiple signals on the same medium, you could use FDM To send multiple signals on a single frequency, you could use TDM. To encode a digital signal on an analog wave, you could use a modem To encode an analog signal into a digital format, you could use a codec