Which word best describes the kind of information found in reference works?

A) exploratory
B) experimental
C) cutting-edge
D) foundational

Foundational

Pertaining to the underlying basis or groundwork of a system, theory, or concept that supports further growth, development, or understanding.

Exploratory

Relating to or involving exploration or investigation, often without a predefined outcome or hypothesis.

Experimental

Involving a methodical trial and error process to discover, test, or demonstrate something.