A Difference Between the Use of Coefficient Alpha and IRT

A difference between the use of coefficient alpha and IRT for evaluating a test's reliability is that with IRT,it is possible to learn

A) how the precision of a scale varies depending on the level of the construct being measured.
B) how the level of the construct being measured varies depending on variations in the item characteristic curve.
C) the precise numerical value for the test's total interitem consistency.
D) All of these

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