MCQ: In NetBill’s protocol for small payments for internet services </br> (i) Key to decrypt information is sent to customer by NetBill only when there is enough amount in debit account </br> (ii) The vendor supplies the key to NetBill server when he receives payment </br> (iii) Checksum of encrypted information received by customer is attached to his payment order </br> (iv) Vendor does not encrypt information purchased by customer</br>

• A. i, ii
• B. i, ii, iii
• C. i, ii, iii, iv
• D. i, ii, iv