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.
Select all that apply:
A. Distance is the input
B. Time of day is the input
C. Time since the person starts walking is the input
D. t represents the input
E. d represents the input
F. the input is not measured in any particular unit
G. for each input, there are sometimes two outputs
H. the input is measured in hours