Methods. a default constructor with no arguments. a second constructor that accepts the Employee's firstName, lastName, the socialSecurityNumber as arguments. These values should be assigned to the object's instance variables: firstName and socialSecurityNumber. * A copy constructor that accepts an existing employee object reference as argument and copies the values of instance variables to the newly created object. . Accessor methods (getFirstName (), getLastName () and getSocialSecurityNumber()) that get the values of instance variables. Mutator methods (setFirstName (string), setLastName (String), setSocialSecurityNumber(string)) that set the values of instance variables