What does it mean when sampling is done without​ replacement?

Choose the correct answer below.

1. Once a sample is​ taken, those individuals cannot be selected for any other samples.
2. Once a sample is​ taken, those individuals are no longer considered part of the population.
3. Once an individual is​ selected, the individual cannot be selected again.
4. Once an individual is​ selected, the individual can be selected again.