A community library charges a fixed fee of R12 and R2 per page copied. In 𝐶 = 12 + 2𝑝, which interpretation is correct? A. Pages copied and total cost are both independent because either value can be placed first in an equation. B. Pages copied are the input; total cost is the output because cost depends on the number of pages. C. Total cost is the input; pages copied are the output because the number of pages depends on the payment. D. The fixed fee is the input; the rate per page is the output because both quantities appear in the rule. Handwritten evidence: Name both quantities and explain the direction of dependence.