Explanation:

Here’s the thing—let’s break down those Articles:

- Article 126: This is about the appointment of an Acting Chief Justice, not ad-hoc judges.

- Article 127: This deals directly with the appointment of ad-hoc judges in the Supreme Court if there’s no quorum of Judges.

- Article 128: Talks about the attendance of retired Supreme Court Judges at sittings of the Supreme Court if called upon.

- Article 125: Covers the salaries of Judges, not appointments at all.

So, Article 127 is the one that’s all about ad-hoc judges. Good call.