A researcher divides school students on the basis of gender and then, using a random-digit table, selects some from each group. This process is called

Dividing the population into strata by gender and then randomly drawing from each is stratified random sampling.

Stratified sampling only is incomplete because it omits the random selection step used with the digit table.

Representative sampling is a goal of good sampling, not the name of this specific technique.

Convenience sampling takes whoever is easily available and involves no strata or randomization.

The random-digit table applied within each gender group supplies the random element inside the strata.

Strata are made internally homogeneous so that each subgroup is fairly represented.