The correct order is "② - ③ - ① - ④" because:
1. First, the customer needs to insert their card (②) into the ATM machine.
2. Then, they need to enter their PIN number (③) to access their account.
3. After that, they can perform transactions such as withdrawing cash (①).
4. Finally, they should remember to take their card back (④) before leaving the ATM.
1. First, the customer needs to insert their card (②) into the ATM machine.
2. Then, they need to enter their PIN number (③) to access their account.
3. After that, they can perform transactions such as withdrawing cash (①).
4. Finally, they should remember to take their card back (④) before leaving the ATM.