A system used to interconnect a set of basic service sets and LANs to create an extended service set is a .

Distribution system.

Explanation:

Cloud computing can be defined as a type of computing that requires shared computing resources such as cloud storage (data storage), servers, computer power, and software over the internet rather than local servers and hard drives.

Generally, cloud computing offers individuals and businesses a fast, effective and efficient way of providing services.

A distribution system also referred to as distributed computing can be defined as a system used to interconnect a set of basic service sets, groups of computers, access points and local area networks (LANs) to create an extended service set that appears to the end users as a single coherent system.

This ultimately implies that, a distribution system comprises of multiple network nodes that are separated physically but interconnected (linked) and communicates with each other, through the use of a network.

Basically, a distribution system is made up of network devices or machines such as servers, containers, computers, virtual machines, etc. Also, each of these network devices or machines has its end users respectively but works toward a common goal and as such making the end users view it's output as a single coherent system.