The cost of a computer system increases with increased processor speeds. The cost C of a system as a function of processor speed is estimated as C =1252 - 3S + 1,200, where S is the processor speed in MHz. Find the processor speed for which cost is at a minimum. Round to the nearest tenth if necessary. . . . ." O A. 2.5 MHz O B. 0.2 MHz O C. 0.1 MHz O D. 1.0 MHz