"this part of the computer fetches instructions, carries out the operations commanded by the instructions, and produces some outcome or resultant information.
a) memory
b) cpu
c) secondary storage
d) input device

CPU

Explanation:

CPU stands for Central Processing Unit, also called: Central Processor or Main Processor.

The CPU is the electronic circuitry within a computer that carries out the instructions of a computer program by performing the basic arithmetic, logic, controlling, and input/output operations specified by the instructions.

professionals can use many types of technology that can them. some examples are, computers (they research and can use for programs for data, they are also used for job applications, school work, and even to make new ideas), speedometers (can get data for unknown data), sometimes something as small as a pen (used for rough drafts, to insert data, and again job applications).