The methodical and exacting process by which a researcher measures a variable is known as ) operational definitionb) correlation analysisc) triangulationd) factor analysis

The answer is A. Operational definition.

Explanation:

The operational definition refers to how operationalization is used to define the terms concerning a process. This process is necessary to determine a phenomenon's nature as well as to know its properties. For example, duration, quantity or chemical composition.

The different procedures could be repeated by anyone or by peers. An operational definition is usually established to have a theoretical definition. The operational definition is related to a process to identify an object through its differences from its empirical experience's background.  

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