With users can make use of other computers' resources within an organization to solve problems involving large scale, complex calculations, such as a circuit analysis or mechanical design -- problems that a single computer is not capable of solving in a timely manner.
a. utility computingb. cloud computingc. mobile computingd. grid computing

With grid computing users can make use of other computers' resources within an organization to solve problems involving large scale, complex calculations, such as a circuit analysis or mechanical design

d. grid computing

Explanation:

The type of computing mentioned here is Grid Computing. Grid computing is nothing but a group of computers that use a wide range of computer resources to accomplish or solve major problems.

It can be thought of as a set of distributed computers or “nodes” without any interactive workloads and all these are connected through middleware software that helps them to communicate with each other over the networks. It is said to form a “peer to peer” computing.

This is way different from cluster computing because the nodes in grid computing are connected in WANs (Wide Area Networks) and have different resource managers whereas in cluster computing the nodes are connected in localized network LAN (Local Area Networks).