The IBM XT microcomputer was released in the market in 1983. It was a significant upgrade from the IBM PC, which was released in 1981. The XT had a larger hard drive, more memory, and a faster processor. It also had a number of new features, such as a built-in speaker and a serial port. The XT was a very popular computer, and it helped to establish IBM as a major player in the personal computer market.
Option A: 1970 is incorrect. The IBM XT was not released until 1983.
Option B: 1971 is incorrect. The IBM XT was not released until 1983.
Option C: 1983 is correct. The IBM XT was released in 1983.
Option D: 1986 is incorrect. The IBM XT was released in 1983.
Option E: None of the above is correct. The IBM XT was released in 1983.