The correct answer is D. Z-80.
The Z80 is an 8-bit microprocessor that was designed by Zilog in 1976. It was one of the most popular microprocessors of the 1970s and 1980s, and was used in a wide variety of computers, including the Tandy TRS-80.
The Z80 is a relatively simple microprocessor, but it is very efficient. It has a 16-bit address bus and an 8-bit data bus. It can operate at speeds up to 4 MHz.
The Z80 was a very successful microprocessor, and it is still used in some embedded systems today.
The Z-8000 is a 16-bit microprocessor that was designed by Zilog in 1979. It was not as popular as the Z80, but it was used in some high-end computers of the 1980s.
The Motorola 6809 is an 8-bit microprocessor that was designed by Motorola in 1979. It was a competitor to the Z80, and it was used in some popular computers of the 1980s, such as the Commodore 64.
The Z-8088 is a 16-bit microprocessor that was designed by Intel in 1979. It was the first microprocessor to use the Intel 8086 instruction set on a 16-bit data bus. It was used in the IBM PC, which was released in 1981.
None of the above is not a correct answer.