The correct answers are D. Use PIN authentication and F. Enable screen timeout, because both controls directly protect a mobile device from unauthorized physical access. Physical access controls are designed to prevent someone from using a device if it is lost, stolen, or left unattended.

According to the Quentin Docter – CompTIA A+ Complete Study Guide, mobile device security begins with lock-screen controls, such as PINs, passwords, biometrics, and automatic locking mechanisms. A PIN authentication requirement ensures that even if an attacker physically possesses the device, they cannot access its contents without the correct credentials.

The guide further explains that screen timeout (automatic locking after inactivity) is a critical security feature. Without it, a device left unattended—even briefly—could be accessed by unauthorized individuals. Enabling a short timeout greatly reduces this risk.

The Travis Everett & Andrew Hutz – All-in-One Exam Guide reinforces that VPNs and antivirus software protect data in transit and against malware, not physical access. Likewise, disabling hotspots and enabling location services are management or tracking features, not access prevention mechanisms.

The Mike Meyers / Mark Soper Lab Manual emphasizes that physical security controls focus on preventing interaction with the device itself, making PIN authentication and automatic screen locking the most effective measures.

Therefore, D and F are the correct answers.