Select all of the statements that apply to an object oscillating on a horizontal spring on a frictionless surface. a. The maximum speed occurs at the point of maximum displacement. b. The maximum acceleration occurs at the point of maximum displacement. c. The maximum potential energy occurs at the equilibrium position. d. The maximum speed occurs at the equilibrium position. e. The maximum kinetic energy occurs at the position of maximum displacement. f. The maximum acceleration occurs at the equilibrium position