When the condition of decision variables to be integer is ignored in an integer programming model, the resulting form is called "Linear Programming relaxed form". Which of the following is/are always true? I. The relaxed format always has fewer constraints than integer programming. II. The convenient solution space of the relaxed form always includes suitable solutions of integer programming. III. In a minimization problem, the best solution value of the relaxed form is always greater than the best solution value of the integer problem. A. II and III B. I and II C. I and III D. I, II and III