Data loss prevention is a sensitive information policy that controls data like financial records, confidential medical information, and social security numbers. To protect such confidential data, implementing a preview mode is the way to protect it from users sharing inappropriately inside or outside the organization.
Option A is incorrect: Public mode is the phase available for all the customers across the globe, and they can use it when it is publicly available.
Option B is incorrect: Private is the mode of a feature released only for selective customers to check the reliability and consistency of features.
Option C is correct: Data Loss Prevention (DLP) is a default policy for Microsoft Teams. currently, it supports preview mode for customers to check its reliability and performance.
Option D is incorrect: This is the stage of features that is mostly available for Team's collaboration office by Microsoft Teams including video, audio conferencing, and video, audio calls, and real- time messaging.
Reference:
https://docs.microsoft.com/en-us/microsoft-365/compliance/dlp-teams-default-policy?view=o365- worldwide