The best solution is Mobile Device Management (MDM), which allows IT administrators to centrally configure, update, and push applications or settings to company-owned devices. When employees report missing features or misconfigurations, MDM platforms enable rapid remote remediation, policy enforcement, patch distribution, and application deployment—all of which can be completed within the 48-hour requirement.

Security+ SY0-701 emphasizes MDM as the primary tool for ensuring consistent configuration baselines, enforcing security restrictions, deploying apps, and preventing unauthorized changes on mobile devices.

EDR (A) provides threat detection, not configuration restoration.

COPE (B) is a device ownership model (Corporate Owned, Personally Enabled); it does not solve configuration issues.

FDE (D) encrypts storage, unrelated to missing features.

Therefore, C: MDM is the correct answer.