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