A nurse needs to collect baseline data before implementing which type of study?

A. Cost-accounting study: Focuses on calculating the cost of services provided, not necessarily requiring baseline health data. B. Cost-benefit study: Compares monetary benefits with the cost, and may use economic or outcome data - but not always requiring baseline health status. C. Cost-effectiveness study: Requires baseline health data to measure the change in health outcomes and assess how cost relates to those improvements. D. Cost-efficiency study: Assesses productivity and resource use but doesn’t require baseline health outcome data.