Under which of the following conditions is it preferable to use stratified random sampling rather than simple random sampling? The population can be divided into strata of equal sizes so that each individual in the population still has the same chance of being selected The population can be divided into a small number of strata so that each stratum contains a large number of individuals. The population can be divided into a large number of strata so that each stratum contains on ly a few individuals. O The population can be divided into homogeneous groups and thena random sample collected from each strata. The population can be divided into heterogeneous groups and then a random sample of strata are collected.