Under the Payment of Gratuity Act, 1972, 'gratuity'

(A) Is payable only in case of death of an employee

(B) Shall be paid by the employer at the rate of thirty days wages on the rate of wages last drawn by the employee for every completed year of service

(C) Is a lump sum payment made by the employer as a mark of recognition of the service rendered by the employee when he retires or leaves service

(D) Is payable only to those employees who are engaged in factories and mines.