The correct answer is D. Multi-stage sampling.
A restricted random sampling technique is a sampling technique in which the sample is selected from a subset of the population. This means that not all members of the population have an equal chance of being selected for the sample.
Stratified sampling is a restricted random sampling technique in which the population is divided into groups, or strata, and then a random sample is selected from each stratum. This ensures that all strata are represented in the sample.
Simple random sampling is a non-restricted random sampling technique in which each member of the population has an equal chance of being selected for the sample.
Systematic sampling is a non-restricted random sampling technique in which every nth member of the population is selected for the sample, starting with a randomly selected member.
Multi-stage sampling is a sampling technique in
which the population is divided into groups, or stages, and then a random sample is selected from each stage. This is a more complex sampling technique than the other techniques listed, and it is often used when the population is large or difficult to access.In conclusion, the correct answer is D. Multi-stage sampling.