For a theory to be complete, four elements must be in place in the model. Which is an accurate characterization of these elements?

a$.$ "where" $-$ direction and extent of the relationship among the variables in the model.

b$.$ "what" $-$ variables or factors included in the model.

c$.$ "how"$-$ theory of the model implying causality.

d$.$ "why" $-$ specific conditions set forth in the model.

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