You need to protect documents that contain credit card numbers from being opened by users outside your company. The solution must ensure that users at your company can open the documents. What should you use? 

Answer options:

A. a sensitivity label policy
B. a sensitivity label
C. a retention policy
D. a data loss prevention (DLP) policy

D

Reference: https://docs.microsoft.com/en-us/microsoft-365/compliance/dlp-learn-about-dlp?view=o365-worldwide