What is the correct procedure for identifying a ball before playing it?

The correct procedure for identifying a ball before playing it involves the player putting an identity marker on the ball. This practice allows for easy identification of the ball during the game and helps avoid any confusion with other players' balls on the course. A personal marker, such as a small dot or a specific line, can be added to distinguish one’s ball clearly.

Marking the ball in this way ensures compliance with the rules of golf, which stipulate that players must confirm their ball before hitting it, especially if there is a possibility of doubt about its identity. This method emphasizes personal responsibility for evaluating and recognizing one's own ball among others.

The other methods mentioned do not align with the standard procedures for identifying a ball. For instance, marking the ball with a pen is not an appropriate method as it could be seen as altering its condition. Relying on approval from an opponent or waiting for a referee's confirmation is unnecessary in most situations unless there is a dispute regarding the identity of the ball.