Based on the selection, what is the author's message about the new definition of planets?
O A.
The new definition for planets needs to be considered as settled moving forward.
OB.
The IAU used poor methods when setting a new definition for planets.
OC.
It is uncertain whether the definition of planet will remain the same in the future.
OD
Pluto should not have been the reason why IAU changed the definition of planets.