Which of the following best describes Secure Electronic Transactions (SET)?

A.
An Internet standard designed to increase the fulfillment process

B.
A protocol that uses encryption in which one key is used to encrypt and decrypt the messages
sent over a secure line

C.
An Internet standard that protects merchants by verifying identities of customers, and protects
customers by shielding their credit card numbers from merchants

D.
The interorganizational exchange of documents in standardized electronic form directly
between participating computers