Which of the following best describes a key difference between surveys and questionnaires in research?
- Surveys are usually conducted with the researcher present, while questionnaires are typically completed without the researcher's presence.
- Surveys can only collect quantitative data, while questionnaires can collect both quantitative and qualitative data.
- Surveys are always paper-based, while questionnaires are exclusively digital.
- Surveys are designed for adults, while questionnaires are designed for young people.