Which of the following most directly led to large data sets being available to healthcare...

The NAHQ CPHQ exam blueprint identifies electronic health records (EHRs) and health information exchanges (HIEs) as the primary drivers of large-scale healthcare data availability.

Option D is correct because EHRs and HIEs aggregate vast amounts of clinical, operational, and outcomes data across populations and settings, enabling advanced analytics and quality measurement.

Options A and B provide limited or secondary data sources. Option C contributes data but is not the primary driver.

Understanding the impact of digital transformation on quality analytics is a key CPHQ competency.