Answer:
D. System/Application Domain
Step-by-step explanation:
A system or application domain is used by an organization to supports its IT infrastructure, holding all the business critical mission system, applications and data. All the resources of the company are contained in this domain, and is accessible by a member.
LAN to WAN domain links the company's infrastructure or local area network to a wide area network or the internet. The WAN domain simply holds publicly the data of an organisation, while remote access domain is meant for a small group of workers in the office or working from home.