Can somebody help me with this question? UESTION 43 1. Select the correct statement(s) regarding OFDM…

Can somebody help me with this
question?
UESTION 43 1. Select the correct statement(s) regarding OFDM a. in the frequency domain, each subcarrier must be separated by a guard channel O b. subcarriers in the frequency domain overlap one another at a specified spacing that prevents adjacent subchannel interference c. OFDM is considered a spread spectrum technology C d. b and c are correct