Recurring Deposits are a type of investment in which a fixed sum of money is deposited every month for a fixed tenure. The interest is paid at the Fixed Deposit Rate (FDR). Let's explore each aspect of recurring deposits in detail:

a) Fixed sum deposited every month:
In recurring deposits, a fixed amount of money is deposited at regular intervals, usually monthly. This fixed sum can be chosen by the investor based on their financial capability and investment goals. It is important to maintain consistency in depositing the fixed sum every month to maximize the benefits of the investment.

b) Period of deposit is a fixed tenure:
The period of deposit or tenure in recurring deposits is predetermined and fixed. It is agreed upon at the time of opening the account and can range from a few months to several years. The investor has to continue depositing the fixed sum for the entire tenure to complete the investment and earn returns.

c) Interest is paid at FDR rate:
The interest earned on recurring deposits is calculated at the Fixed Deposit Rate (FDR) applicable to the bank or financial institution where the investment is made. The FDR rate is determined by various factors such as market conditions, the tenure of the deposit, and the policies of the institution. The interest is usually compounded on a quarterly basis, which means it is added to the principal amount and further interest is calculated on the new total.

d) All of the above:
The correct answer is option 'D' - all of the above. This means that all the statements mentioned in options a, b, and c are true for recurring deposits. A fixed sum is indeed deposited every month, the period of deposit is a fixed tenure, and the interest is paid at the FDR rate.

Recurring deposits are a popular investment option for individuals who want to save money regularly and earn a fixed return on their investment. It provides a disciplined approach to savings and can be an effective way to achieve short-term financial goals or create an emergency fund.