3. which of the following statements about diodes and triodes is correct? a. adjusting the grid within a diode will have more of an effect than it will in the triode. b. diodes, which are often utilized as rectifiers, have two electrodes. c. diodes are often utilized as amplifiers, whereas triodes are often used as rectifiers. d. triodes have three electrodes, whereas diodes have only a grid and a cathode.