Which of the following is a core characteristic of the Tukey-Kramer procedure?

• A. It compares every pair of group means using the studentized range distribution and controls the familywise Type I error rate.
• B. It computes pairwise chi-square tests for categorical outcomes and aggregates results with the studentized range distribution.
• C. It only compares the group with the largest mean against all others, using Bonferroni-adjusted t-tests and ignoring unequal sample sizes.
• D. It uses ranks and median differences to compare pairs and is insensitive to unequal variances.

Answer: (A)