What will be the output of this PHP code?

What will be the output of this PHP code?

class ParentClass {
    protected function greet() {
        return "Hello from Parent";
    }
}
class ChildClass extends ParentClass {
    public function greet() {
        return parent::greet() . " and Child";
    }
}
$child = new ChildClass();
echo $child->greet();