15) Which is the model in E - Commerce, if the seller and the buyer are the both individuals?

16) Which option in E - Commerce, helps to keep selected products until checkout / payment?

17) Which is the function of specifying access rights to resources related to information security?

18) Which refers to paying the money back to the buyer after the price has been deducted from the account?

19) Which card permits online payment using balance amount available in bank account?