What will be output in example №30

In this exercise, you need to predict the output of a program working with optional references to a class object. Analyze how the state of objects changes and what values will be accessible through optional chaining.

import Foundation

class Dog {
    var name: String
    init(name: String) {
        self.name = name
    }
}

var dog1: Dog? = Dog(name: "Buddy")
var dog2: Dog? = dog1

dog1?.name = "Buddy1"
print(dog2?.name ?? "nil")

Determine what value will be printed to the console when this code is executed.