What is the contribution of Douglas Engelbart in the gradual development of computers?

ADeveloped the first mouse ✓ Correct

BDeveloped the first operating system (OS)

CDeveloped the first vacuum tube

DDeveloped the World Wide Web (WWW)

Correct answer: (A) Developed the first mouse

Explanation

Douglas Engelbart is credited with developing the first computer mouse as a pointing device.

His mouse used two wheels to track movement across a surface and select items on screen.

Developing the first operating system was not his work, that lineage lies with other pioneers.

The first vacuum tube belongs to early electronics history, well before Engelbart's mouse.

The World Wide Web was created by Tim Berners-Lee, not by Engelbart.

Engelbart also pioneered ideas like hypertext and interactive computing in the 1960s.

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