What term refers to a collection of records maintained in an organized manner by an agency?

The term that accurately describes a collection of records maintained in an organized manner by an agency is "archive." An archive is specifically designed for the storage and preservation of documents and records for long-term retention. This term is commonly used in various fields, including government, businesses, and libraries, to refer to collections that require organized management for historical or reference purposes.

On the other hand, while "system" might refer to structured arrangements or processes that manage information, it doesn’t specifically imply organized records. A "database" is a more technical term referring to an electronic collection of data that allows for easy access and management, but it does not cover the aspect of physical records or long-term archival storage. "Record collection," while it conveys the idea of a gathered set of documents, lacks the formal connotation that "archive" provides, particularly in contexts involving preservation and organizational standards.