In an aquaculture study, the following variables were measured on each fish: sex, initial weight(g), body temperature (rC), weight gain(g). The scale of these four variables (in order) are: (a) Nominal, ratio, ratio, ratio (b) Nominal, ratio, interval, interval (c) Ordinal, ratio, interval, ratio (d) Nominal, ratio, interval, ratio (e) Ordinal, interval, ratio, interval