To Determine If Statistical Software a Is Uniformly Superior to Software

To determine if statistical software A is uniformly superior to software B for the population of statistical consultants, from which random samples are taken to conduct a study, one needs

A) a nested design with a fixed-effects model.
B) a crossed design with a fixed-effects model.
C) a nested design with a random-effects model.
D) a crossed design with a random-effects model.
E) a nested design with a mixed-effects model.
F) a crossed design with a mixed-effects model.