Atechnician is checking the operation of the electronic throttle control (etc) system using a factory or factory-level scan tool. to perform this test on a chrysler vehicle, you would use the "throttle follower test" as shown on the scan tool. which of the following is needed to perform this process? a. an assistant to check that the throttle plate is moving b. nothing—the throttle will perform a self-test by closing and then opening. c. a running engine d. an assistant to hold open the throttle plate