Which action is permissible if a player is cautioned for unsporting behavior?

When a player is cautioned for unsporting behavior, the referee issues a yellow card, and while this serves as a warning, it does not require the player to leave the field. The player is allowed to remain on the field of play following the caution, and there is no immediate impact on their participation in the match. This allows them to continue competing while also acknowledging the infraction committed.

The other actions mentioned are not appropriate responses to a caution. Stopping play immediately is not necessary or customary for a caution, as it is typically only stopped if the incident requires attention or a formal signal. The referee cannot choose to ignore the caution because it is a formal part of game management intended to address misconduct. Finally, it is not mandated that a cautioned player must leave the game, as the purpose of a caution is to reprimand rather than expel. Thus, the only permissible action in regards to the player's participation after being cautioned is that they can remain on the field.