Survey research on a single case with a view to revealing important features about its nature corresponds to which of the following research designs?

Case study design conducts intensive survey of a single case to reveal key features of its nature.

It focuses depth on one bounded unit rather than breadth across many.

Cross-sectional design collects data from many cases at a single point in time.

Longitudinal design studies the same cases repeatedly over time.

Comparative design contrasts two or more cases to highlight differences.

Case studies often blend multiple data sources for a rich account.