What does the official need to ensure is done before the toss in a jump ball?

Before the toss in a jump ball, it is crucial for the official to ensure that the jumpers are properly positioned. This involves making sure that the players designated to jump are in the correct spot in the center circle, facing each other with their feet behind the line marked for the jump. Proper positioning is essential for the jump ball to take place correctly and to avoid any unfair advantage or confusion during the process. The jumpers must adhere to the rules regarding their stance and interaction during the toss, which sets the foundation for a fair competition.

While it is also important for all players to be in their positions and for coaches to be seated, the specific focus on the jumpers highlights the unique role they play during the jump ball, making their correct positioning the priority for the official at that moment.