12.) A technician is using a scan tool to force a vehicle's onboard computer to perform a selected test. This is called: OA. a parasitic load test. OB. an active command test OC. an open communication test. D. a vehicle computer short test.

## Step 1<br />The problem is asking us to identify the correct term for a specific type of test performed by a technician using a scan tool on a vehicle's onboard computer. The options provided are:<br />A. a parasitic load test<br />B. an active command test<br />C. an open communication test<br />D. a vehicle computer short test<br /><br />## Step 2<br />We need to understand what each of these tests means:<br />- A parasitic load test is a test that checks for any parasitic drain on the battery.<br />- An active command test is a test where the technician sends a command to the vehicle's onboard computer to perform a specific test.<br />- An open communication test is a test that checks the communication between the scan tool and the vehicle's onboard computer.<br />- A vehicle computer short test is not a standard term in automotive diagnostics.<br /><br />## Step 3<br />Given the context of the problem, where the technician is using a scan tool to force the vehicle's onboard computer to perform a selected test, the correct answer is B. an active command test. This is because the technician is actively commanding the onboard computer to perform a specific test, which is the definition of an active command test.