Exam CS0-002 topic 1 question 168 discussion

A financial organization has offices located globally. Per the organization's policies and procedures, all executives who conduct business overseas must have their mobile devices checked for malicious software or evidence of tampering upon their return. The information security department oversees this process, and no executive has had a device compromised. The Chief Information Security Officer wants to implement an additional safeguard to protect the organization's data.
Which of the following controls would work BEST to protect the privacy of the data if a device is stolen?