Based on the information provided, we can logically deduce that technician A was right. Therefore, the correct answer is: a. A only.
In order for a technician to diagnose a brake system, the following symptoms should be adequately and appropriately checked and used by the technician:
This ultimately implies that, a symptom you should use when diagnosing brake system troubles is improper braking action.
Read more on braking system here: https://brainly.com/question/24751467
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