Complete the toString method. This method returns a string version of a student object in the form: Name: Brown, David ID: 123456 Birthdate: 1962-10-25

a) toString() { return "Name: " + this.lastName + ", " + this.firstName + " ID: " + this.id + " Birthdate: " + this.birthdate; }
b) toString() { return "Name: " + this.firstName + " " + this.lastName + " ID: " + this.id + " Birthdate: " + this.birthdate; }
c) toString() { return "Name: " + this.firstName + ", " + this.lastName + " ID: " + this.id + " Birthdate: " + this.birthdate; }
d) toString() { return "Name: " + this.lastName + " " + this.firstName + " ID: " + this.id + " Birthdate: " + this.birthdate; }