Explanation:

Understanding different payment systems is essential for financial transactions, especially distinguishing between domestic and international mechanisms. - **Option A (RTGS - Real Time Gross Settlement):** RTGS is a system used for large-value domestic interbank funds transfers in India. It facilitates real-time transfer of funds from one bank to another within India. It is not designed for international money transfers. - **Option B (NEFT - National Electronic Funds Transfer):** NEFT is another electronic funds transfer system primarily used for domestic transfers in India. It operates on a deferred net settlement basis, allowing one-to-one funds transfer between banks within the country. Like RTGS, it is not used for international transactions. - **Option C (SWIFT - Society for Worldwide Interbank Financial Telecommunication):** This is the correct answer. SWIFT is a global network that enables financial institutions worldwide to send and receive information about financial transactions in a secure, standardized, and reliable environment. It is the primary and most widely used system for facilitating international money transfers and cross-border payments by sending payment orders between banks. - **Option D (Demand Draft):** A Demand Draft is a pre-paid negotiable instrument issued by a bank, instructing another bank or its own branch to pay a certain sum to the payee. While it is a method of payment, it is primarily used for domestic transactions and is not an electronic system for international money transfers in the same way SWIFT is.