Does the scale reading decrease, increase, or stay the same?

The scale reading decreases.The fluid exerts an upward force on the ball. Thus, by Newton$$s third law, the ball exerts a downward force on the fluid. This downward force decreases the scale reading.The scale reading increases.The fluid exerts an upward force on the ball. Thus, by Newton$$s third law, the ball exerts a downward force on the fluid. This downward force raises the scale reading.The scale reading stays the same. The fluid exerts an upward force on the ball which is equal to the ball's weight. There is no force to change the scale reading.The scale reading stays the same. The tension force of the string always balances the ball, so the ball doesn't affect the scale reading.