(1) Option C: upper and lower limit management of credit card overdraft interest rate. The upper limit of overdraft interest rate is 0.7 times of daily interest rate and the lower limit is 0.7 times of Et interest rate. (2) Option D: The card issuer provides the cardholder with card service that exceeds the credit limit, and no over-limit fee is charged. Refer to the teaching materials P 1 14, P 1 15.