Which of the Following Statements Best Describes Primary Research

Which of the following statements best describes primary research?

A) Takes place to explore a particular concept, or issue, without regard for a specific problem, and may be carried out to simply gain a better understanding of the overall concepts.
B) Is undertaken to solve a specific problem or provide a solution to a practical question.
C) Refers to research that has involved the collection of original data specific to that particular research project, for example through using research methods such as questionnaires or interviews.
D) Refers to research where no such original data is collected, but the research project uses existing (or secondary) sources of data, for example census or archive data.