What constitutes a major infringement in netball?

A major infringement in netball is specifically characterized by actions that disrupt the integrity of the game to a significant extent. Moving the goalpost to interfere with a shot directly impacts the play and the ability of the opponents to score, which is a severe violation of the rules. This action not only alters the physical conditions of the game but also undermines fair play, as it strategically disadvantages one team over another.

In contrast, the other choices refer to lesser infractions or improper behaviors that do not have the same weight as moving the goalpost. For example, infringements of the rules governing ball play may lead to penalties but are typically categorized as minor compared to manipulating equipment. Minor violations by players usually result in free passes or other small sanctions rather than major repercussions. Incorrect player substitutions may also lead to penalties, but they do not directly impact ongoing gameplay in as significant a way as moving the goalpost does. Therefore, while all choices involve rules, only moving the goalpost represents a major infringement due to its direct interference with the scoring process and game fairness.