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

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

A.
Originated by VISA and MasterCard as an Internet credit card protocol

B.
Originated by VISA and MasterCard as an Internet credit card protocol using digital signatures

C.
Originated by VISA and MasterCard as an Internet credit card protocol using the transport layer

D.
Originated by VISA and MasterCard as an Internet credit card protocol using SSL