Which of the following types of variables is often referred to as a linker in a causal relationship?

Question

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A mediating variable is a specific type of extraneous variable that functions as a go-between or linker in a causal relationship between two other variables. A covariate is a variable (intrinsic or extrinsic factor) in the research situation that has an extraneous effect on the dependent variable. A demographic variable is an intrinsic factor, or characteristic of a study participant.

Which of the Following Types of Variables Is Often Referred