Which sampling method is the MOST appropriate in studying the opinions of stay-at-home mothers in all towns across the country? (4 points)

Simple random sampling, because the people in the sample are accessible and available

Stratified sampling, because there are specific subgroups to investigate

Systematic sampling, because of the ease in selecting every nth person

Cluster sampling, because the studied population is spread across a wide area such that simple random sampling would be difficult to implement

All the above sampling methods