A large institution, such as a bank, may have thousands of transactions to process in which no user interaction is required; which type of computer system are you most likely to use?

A) high-end workstation

B) mainframe

C) Windows PC

D) real-time system

The correct answer to the following question will be Option B (Mainframe).

Explanation:

Mainframe computers are computers that are mainly used by large companies for commercial applications; massive data analysis, including survey, business and client reports, commercial resource preparing, and transaction processing.

And Mainframe machine is so easy for use when a large organization, like a bank, can handle millions of transactions where no user intervention is required.

There's no other way that can make the transaction in millions. So, Option B will be the right answer.