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When a client exercises at 65% of VO2 max for 90 min, what is the typical response of the R (respiratory exchange ratio) value, and what does this response mean?
a. It typically drifts upward, indicating a greater reliance on carbohydrate for fuel.
b. It typically drifts upward, indicating a greater reliance on fat for fuel.
c. It typically drifts downward, indicating a greater reliance on carbohydrate for fuel.
d. It typically drifts downward, indicating a greater reliance on fat for fuel.