85. The «hot stove» rule is sometimes used to illustrate the principles of fair, effective discipline. Which of the following principles illustrates the principle of discipline carrying a clear warning?

The correct answer is D because it directly illustrates the principle of discipline requiring a clear warning, mirroring how the predictable consequence of touching a hot stove is known beforehand. Options A, B, and C represent consistency, immediacy, and impersonality, respectively, which are other aspects of the 'hot stove' analogy but not the principle of a clear warning.