Which of the following statements is true regarding the Callaway handicap system?

The Callaway handicap system is designed to assess a player's ability based on their performance in actual rounds of golf played. By taking into account the scores from rounds played, the system helps to create a more accurate reflection of a player's skill level as it relates to their typical performance. This is significant because the Callaway system provides a way to calculate a player's potential ability based on real-life competition rather than solely relying on established handicaps or limited scoring criteria.

The other options refer to aspects that do not align with the principles of the Callaway system. For instance, though established handicaps may be useful in other contexts, the Callaway system specifically allows for players without established handicaps to be assessed based on their performance. Additionally, it is not exclusive to professional players, as it can be applied to any level of golfer. The system does not restrict itself to only counting the best scores; instead, it averages out scores to create a more comprehensive evaluation of a player's skill.