Identify the correct sequence of steps to be followed in the trading procedure at Stock Exchange

• A. Opening a trading account and Demat account, Placing an order, Settlement of order, Execution of order
• B. Settlement of order, Opening a trading account and Demat account, Placing an order, Execution of order
• C. Opening a trading account and Demat account, Placing an order, Execution of order, Settlement of order
• D. Placing an order, Opening a trading account and Demat account, Execution of order, Settlement of order