Which of the following statements best describes sink condition?
a. In sink condition, the saturation concentration of the drug and its concentration in the bulk solution are the same.
b. Sink condition implies that the drug is insoluble in the dissolution medium.
c. In sink condition, drug concentration in the bulk solution corresponds to up to 20% of the saturation concentration.
d. In sink condition, the saturation concentration of the drug is 20% higher than its concentration in the bulk solution.

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