Final answer:
RPE and symptom scales should be used before the test begins.
Step-by-step explanation:
RPE stands for Rate of Perceived Exertion, which is a scale used to measure the intensity of physical activity. Symptom scales, on the other hand, are used to assess the presence and severity of symptoms during exercise or physical exertion. Both RPE and symptom scales are typically used before and during a test or exercise to monitor the individual's response and ensure their safety. Therefore, the correct answer is B. Before the test begins.