The correct answer is option 4.Concept:Secure electronic transaction (SET) was an early communications protocol for securing electronic debit and credit card payments used by e-commerce companies. Consumer card information was securely transmitted via electronic portals on the internet using secure electronic transactions.Merchants, hackers, and electronic thieves were unable to access customer information due to secure electronic transaction protocols keeping out personal details of the card information.Safeguard electronic transaction (SET) was a 1996 communications protocol that e-commerce websites utilized to secure electronic debit and credit card payments.Merchants may validate their clients' card information without actually seeing it, safeguarding them against account theft, hacking, and other illicit activities.Most major electronic transaction providers, such as Visa and MasterCard, offered secure electronic transaction protocols.Hence the correct answer is a secure electronic transaction.