What Is True of the Youden Index? Select All That

What is true of the Youden index? Select all that apply.

A) The Youden index is computed by adding the sensitivity and specificity values, and then subtracting the number 1 with values ranging from 0 to 1.
B) The data point associated with a Youden index value closest to 100% is the optimal cutoff score.
C) The optimal cutoff score has the greatest accuracy and corresponds to the score with the greatest true-positive score and the lowest true-negative score.
D) The Youden index is the cutoff score at the most northwest point on the operating characteristic curve.