What preventative measure could have MOST likely stopped a data breach caused by an executive charging a phone in a public area?

Using a USB data blocker would have been the most effective preventative measure to stop a data breach in this scenario. A USB data blocker is a device that allows power to flow to a phone while preventing any data transfer. This could protect the executive’s phone from being compromised while charging in a public area, where malicious actors might manage to access data via public charging ports, often referred to as "juice jacking."

In contrast, a firewall primarily protects networks rather than individual devices and doesn’t prevent direct connection vulnerabilities. A device pin adds a layer of protection to the device but does not prevent data access through a compromised charging cable or port. Biometrics, while another layer of security for device access, wouldn’t address the risk of data exfiltration through unauthorized data connections while charging in a public space.