Correct Option: D

The Department of Posts, trading as India Post, is a government-operated postal system in India. Owing to its far-flung reach and its presence in remote areas, the Indian postal service is involved in other services such as small savings banking and financial services. The post office has offered and continues to offer various savings schemes, including National Savings Certificates, the Public Provident Fund, Savings Bank Accounts, Monthly Income Schemes, Senior Citizen Saving Schemes, and Time Deposit Accounts. Small savings accounts in rural post offices were a keystone to the department’s policy and the department had the largest number of savings accounts across the country.