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Prototypal Inheritance

In this question, we have a Dog constructor function. Our dog obviously knows the speak command. What gets logged in the following example when we ask Pogo to speak?

function Dog(name) {
  this.name = name;
  this.speak = function() {
    return 'woof';
  };
}

const dog = new Dog('Pogo');

Dog.prototype.speak = function() {
  return 'arf';
};

console.log(dog.speak());

Select one:

woof

arf