The correct answer is A. PDP-1, 1959.
The PDP-1 was a minicomputer developed by Digital Equipment Corporation (DEC) and introduced in 1959. It was one of the first commercial computers to be used for time-sharing, and it was also one of the first computers to be used for computer graphics. The PDP-1 was a major success for DEC, and it helped to establish the company as a major player in the computer industry.
The PDP-1 was a 12-bit computer with a clock speed of 1.2 MHz. It had 4,096 words of memory, and it could be programmed in PDP-1 assembly language or in a high-level language called BASIC. The PDP-1 was a popular choice for scientific and engineering applications, and it was also used for education and business.
The PDP-1 was a significant milestone in the history of computing. It was one of the first commercial computers to be used for time-sharing, and it was also one of the first computers to be used for computer graphics. The PDP-1 was a major success for DEC, and it helped to establish the company as a major player in the computer industry.
The other options are incorrect for the following reasons:
- Option B, 1MB System/36, 1960, is incorrect because the 1MB System/36 was not a minicomputer. It was a mainframe computer that was introduced in 1960.
- Option C, PDP-11 1961, is incorrect because the PDP-11 was not introduced in 1961. It was introduced in 1970.
- Option D, VAX 11/780, 1962, is incorrect because the VAX 11/780 was not introduced in 1962. It was introduced in 1978.
- Option E, None of the above, is incorrect because the PDP-1 was the world’s first minicomputer.