Three charges are located on the corners of a right-angle triangle as in the figure. If a = 3.0 mm, b = 4.0 mm, Q = 45 nC in the figure, what is the magnitude of the total electric force acting on the charge Q located at 4.0 mm from the origin on the x-axis? Select one: A. 2.03 N B. 12.15 N C. 9.12 N D. 4.67 N