Varun suspects the vehicle he is working on has a network communications fault. He checks everything that does and does not work, performs a module status test, checks the resistance of the terminating resistors, checks the data BUS for voltages, and then uses a digital storage oscilloscope to monitor the waveforms of the BUS circuit. Varun still has not isolated the problem. What is the next step he should perform? Question 3 options:   Varun should check the data line terminals.   Varun should follow the factory service information instructions to isolate the cause of the fault.   Varun should check the state of health.   Varun should use a digital multimeter set to DC volts so he can monitor communications and check the BUS for proper operation.