The revenue derived from the production of x units of a particular commodity is R(x) =(48x-x²)/(x²+48)million dollars. What level of production results in maximum revenue?

A. Maximum at x = 6 and maximum revenue is R(6)=18 (million dollars)

B. Maximum at x = 6 and maximum revenue is R(6)=2.05 (thousand dollars)

C. Maximum at x = 6 and maximum revenue is R(6)=3 (million dollars)

D. Maximum at x = 7 and maximum revenue is R(7)=2.05 (million dollars)