In terms of establishing validity, a key difference between the standard error of estimate and the ...

In terms of establishing validity, a key difference between the standard error of estimate and the standard error of measurement is that the standard error of estimate indicates the
 
  a) margin of error due to the imperfect validity of the test, while the standard error of measurement indicates the margin of error due to the unreliability of the test.
   b) margin of error for a single examinee, while the standard error of measurement indicates the margin of error for the average of a group of examinees.
   c) validity of a test based on sampling of the universe of potential items, while the standard error of measurement indicates the validity of a test based on its relationship with an external criterion.
   d) margin of error expected in the test score, while the standard error of measurement indicates the margin of error expected in the criterion score.