When a transaction is processed online, how can the merchant verify the customer's identity?

When a transaction is processed online, how can the merchant verify the customer's identity? Correct Answer use secure electronic transactions

When a transaction is processed online, use secure electronic transactions the merchant can verify the customer's identity by using secure electronic transactions.

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Pharmacists recently conducted a study with respect to the reasons their customers purchased eye drops to soothe eye dryness. Dry eyes were more frequently experienced by customers who wore contact lenses than by custorners who did not wear contact lenses. The pharmacists concluded that wearing contact lenses, by itself, can cause contact wearers to have dry eyes.
The class was held online. here ‘online’ is -