Final answer:
The correct association of the application program, SQL engine, and database is Client, Server, Database. This terms are widely used in computer science and refers to the components of database management systems.
Step-by-step explanation:
When discussing the relationship between an application program and a SQL engine, the correct association is Client, Server, Database. The application program that issues SQL commands is referred to as the client. The SQL engine, which processes these commands, is known as the server. Lastly, the structured collection of data that these commands are executing upon is the database. This terminology is ubiquitous in the field of computer science and information systems, particularly when discussing database management and client-server architectures.