If Gertie wants to keep her financial information safe while buying a smartwatch online, what should she do?

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Using a virtual account number is the best option for Gertie to keep her financial information safe while purchasing a smartwatch online. A virtual account number is a temporary, randomly generated card number linked to her actual credit card. This means that even if the virtual number is compromised during the transaction, her real financial information remains protected. It reduces the risk of fraud and identity theft, providing an extra layer of security for online purchases.

In comparison, using a credit card directly while still offers some level of protection, it exposes the actual credit card number to potential breaches and unauthorized access. Sharing bank details is inherently risky as it provides direct access to her bank account. Paying with cash is not feasible for online purchases, as digital transactions require electronic methods; therefore, it doesn't apply in this scenario.