Which of the following are the features of social security?        
I.            Social security must provide protection against all the ordinary risks of life as well as special risks of employment.      
II.            All social security programmes differ from country to country but they aim at providing some form of cash payment.      III.      It provides financial help in case of contingencies such as unemployment, maternity, work injury, industrial disease, old age, widowhood and orphanhood etc.