When a smartphone is lost, especially one that might contain sensitive or private data, the primary concern is to ensure that any data on the device cannot be accessed by unauthorized persons. Among the options provided:
* Remote lock: This option will lock the device remotely, preventing access. However, it does not remove the data and might not be effective if the device is powered off or reset.
* Remote wipe: This is the best option as it allows the technician to erase all data from the device remotely, ensuring that sensitive information is not accessible to anyone who finds or steals the device.
* Remote access: This option would allow a technician to access the device remotely, but it would not directly prevent unauthorized access or data breaches.
* Remote encrypt: Encrypting the device remotely might not be possible if the device is not accessible or turned on, and it does not remove existing data which could be at risk.
Reference: CompTIA A+ Exam Objectives [220-1102] - 3.4: Given a scenario, use best practices to secure a mobile device.