Which invention was at the heart of technological revolution?

A) Microprocessor
B) Memory Processor
C) ALU
D) Calculator

Microprocessor

An integrated circuit that contains the functions of a central processing unit of a computer, responsible for performing arithmetic, logic, controlling, and processing operations.

ALU

Arithmetic Logic Unit, a critical component of a computer's central processing unit (CPU) that performs arithmetic and logic operations on the data it processes.