Mutate Versus Reassign

class Dog:
    tricks = []

    def __init__(self, name):
        self.name = name

d1 = Dog("Rex")
d2 = Dog("Fido")

d1.tricks.append("sit")
d2.tricks = ["roll over"]

Select all statements that are true after these two lines run.

d1.tricks and Dog.tricks refer to the exact same list object (d1.tricks is Dog.tricks is True).

d1.tricks.append("sit") mutates the same list object that Dog.tricks refers to, so Dog.tricks becomes ['sit'].

d2.tricks = ["roll over"] creates a new entry in d2.__dict__, so d2.tricks no longer refers to the shared class-level list at all.

Dog.tricks ends up equal to ['sit', 'roll over'], since both instances wrote to tricks.