运行以下 Python 代码， 结果是？ （ ）

class Person():

        def __init__(self, name, age):

                self.name = name

                self.age = age

        def say_hello(self):

                print(f"Hello, my name is {self.name}. I am {self.age} years old.")

person1 = Person("Alice", 25)

person2 = Person("Bob", 30)

person1.say_hello()