Consider the following code snippet. What will be the output?

class Person {
  constructor(name) {
    this.name = name;
  }
  sayHello() {
    console.log(`Hello, ${this.name}!`);
  }
}
class Student extends Person {
  constructor(name, grade) {
    super(name);
    this.grade = grade;
  }
  sayHello() {
    super.sayHello();
    console.log(`I am in grade ${this.grade}.`);
  }
}
const student = new Student('John', 8);
student.sayHello();