As the Chief Information Security Officer, You Want to Ensure

As the Chief Information Security Officer, you want to ensure data shared securely, especially when shared with third parties outside the organization. What protocol provides the ability to extend the network perimeter with the use of encapsulation and encryption?

A) File Transfer Protocol (FTP)
B) Virtual Local Area Network (VLAN)
C) Simple Mail Transfer Protocol
D) Virtual Private Network (VPN)