In a cylindrical turning process, the workpiece diameter is 50mm. The feed per revolution and depth of cut are set as 0.5 mm/rev and 0.6 mm respectively. If a minimum MMR of 45,000mm³/min must be maintained. What is the minimum spindle speed in revolutions per minute?
a. 1,254 rpm
b. 956 rpm
c. 765 rpm
