Find the maximum profit given by the revenue and cost functions​ below, where x is in thousands of units and​ R(x) and​ C(x) are in thousands of dollars.   R(x)=107x-x^2 C(x)=1/3x^3-6x^2+63x+32   A 400 thousand dolars   B. 464 thousand dollars   C. 256 thousand dollar   D 688 thousand dollars.

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A:

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