Port Address Translation of NAT allows several hundred workstations to access the internet with a single public internet address.
What do you mean by NAT?
Network address translation (NAT) is a method of mapping one IP address space to another by altering network address information in packet IP headers while they are being routed through a traffic routing device. When a network was moved or when the upstream Internet service provider was switched but could not route the network's address space, the technique was originally employed to avoid the requirement to assign a new address to every site.
Port Address Translation (PAT) is a Network Address Translation (NAT) extension that allows numerous LAN devices to be mapped to a single public IP address in order to save IP addresses.
To learn more about NAT
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Answer: C) A model of software distribution. Instead of simply selling an application, the vendor hosts the applications and offers access for a small subscription fee.
Explanation: Software as a service(SaaS) is the cloud computing service that is used as software distribution model .It functions by delivering the applications that are hosted by the third-party over the internet towards the customers.It function on the basis of servers of Saas provider.
Other options are incorrect because users don't log into the workstation directly. This model does not provides security regarding the confidential digital data.
It does not ensure the information service available to the user as per requirement.Thus, the correct option is option(c).