Primary data differs from secondary because:
primary data are collected by observing people and secondary data are collected by asking them.
primary data are newly collected while secondary data were previously collected for another purpose.
primary data are collected during the first round of research while secondary data are only collected when the original research was inadequate.
primary data provides answers for research objectives while secondary data are just 'nice to know'.
Answer: primary data are newly collected while secondary data were previously collected for another purpose