Identify the correct participants involved in an online transaction.

The correct answer identifies the key participants involved in an online transaction as the acquirer, issuing bank, cardholder, and merchant.

In an online transaction, the acquirer plays a crucial role as the financial institution that processes credit and debit card payments on behalf of the merchant. Meanwhile, the issuing bank is the financial institution that issued the card to the cardholder. This entity is responsible for authorizing transactions and ensuring that the funds are available. The cardholder is the individual making the purchase and, finally, the merchant is the business or entity selling goods or services.

This combination accurately reflects the primary roles involved in processing an online payment. Other options may include participants that do not directly interact in a typical online transaction workflow or might mix up roles that are not standard in the electronic payment landscape.