Which of the following was the first Intel processor introduced?

Explanation:-

The Intel 4004 is a 4-bit central processing unit (CPU) released by Intel Corporation in 1971. It was the first commercially available microprocessor by Intel. The 4004 was the first in a long line of Intel CPUs.

The chip design started in April 1970, when Federico Faggin joined Intel, and it was completed under his leadership in January 1971.