A user's phone contains customer's PII. Which of the following is the best method for securing the phone?

Using a fingerprint lock is considered the best method for securing the phone in a scenario where it contains personally identifiable information (PII) such as customer data. Fingerprint locks provide a high level of security because they rely on biometric authentication, which means that access is granted based on unique physical characteristics of the user. This makes it significantly harder for unauthorized individuals to gain access to the device compared to other methods.

Biometric locks, like fingerprint scanning, also offer convenience because users can unlock their phones quickly and easily without the need to remember and input a passcode or PIN. In a situation where sensitive information is involved, such as customer PII, having a more robust security measure in place can help protect this data from potential breaches or unauthorized access.

While passcodes and PINs are strong security measures as well, they can be more easily compromised through techniques like social engineering or brute-force attacks. Swipe locks are generally the least secure option among those listed, as they do not require any specific authentication and can be easily bypassed. Thus, a fingerprint lock is optimal for safeguarding sensitive information stored on the phone.