Question: A commuter sees a flyer on a train with a QR code advertising high interest rates at an online bank. The commuter scans the code,

A commuter sees a flyer on a train with a QR code advertising high interest rates at an online bank. The commuter scans the code, but the website indicates the promotion has ended. Within a few days, the commuter's phone starts sending messages to everyone in the contacts with a malicious link. How could this have been prevented?
a. Do not scan QR codes from unfamiliar sources.
b. Ensure the antivirus software installed on the phone is up to date.
c. Open a browser in private mode before scanning the QR code.
d. Download and install a secure browser before scanning the QR code.

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