Select all statements below that correctly describe Shannon's formula. a. If the channel bandwidth and noise are kept constant, then the channel capacity increases only if the signal power increases. b. The channel capacity decreases proportionally with increasing the channel bandwidth, provided that the channel's signal-to-noise (SNR) ratio is kept constant. c. If the channel bandwidth and signal power are kept constant, then the channel capacity increases only if the channel noise decreases. d. If the channel bandwidth and signal power are kept constant, then the channel capacity increases only if the channel noise increases. e. The channel capacity increases proportionally with increasing the channel bandwidth, provided that the channel's signal-to-noise (SNR) ratio is kept constant