The correct answer is A. Network Address Translation.
NAT is a technique for remapping one or more network addresses into another address space. It is commonly used in home and small office networks to allow multiple devices to share a single public IP address. NAT also has applications in large enterprise networks, where it can be used to improve security and manageability.
Option B, Network Administration Tool, is incorrect. NAT is not a tool, but a technique.
Option C, Novell Address Transfer, is incorrect. Novell Address Transfer is a proprietary protocol used by Novell NetWare networks to transfer address information between servers.
Option D, Newly Added Technology, is incorrect. NAT is a well-established technology that has been in use for many years.