What does the verification code used by the Postal Savings Bank of China for transfer business mean?

1. Calculate verification code: displays an arithmetic expression, requiring you to calculate the result of the expression and enter the correct answer. For example, the verification code displays "5 7=?" and you need to enter the correct answer "12".

2. SMS verification code: After you enter sensitive information such as bank card number and password, the bank will send an SMS verification code to your mobile phone. You need to enter the correct verification code to complete the transfer business.