Which statement is true regarding mainframe computers?

Mainframe computers are designed to handle and process vast amounts of data efficiently, making them ideal for large-scale enterprise applications. These powerful machines can perform millions of transactions per second and support thousands of concurrent users, providing robust processing capabilities that surpass those of traditional desktop or personal computers. Their architecture is optimized for processing large databases and executing complex calculations that are essential for business operations such as financial transactions, inventory management, and large-scale scientific calculations.

In contrast, the other statements do not accurately reflect the capabilities or intended use of mainframe computers. They are not primarily for personal computing, as that is the domain of personal computers and laptops. Mainframes are specifically built for business applications, performing tasks that require reliability and scalability, and they are not lightweight devices, commonly weighing hundreds to thousands of pounds, depending on the configuration.