3. The distance a person walks, d, in kilometers, is a function of time, t, in minutes, since the walk begins. Select all true statements about the input variable of this function. A. Distance is the input. B. Time of day is the input. C. Time since the person starts walking is the input. D. 1 represents the input. E. d represents the input. F. The input is not measured in any particular unit. G. The input is measured in hours. H. For each input, there are sometimes two outputs.