$1.$ A microprocessor consists of a data, address, and control buses b $.$ a microprocessor $,$ memory, and $1/$ O sections $.$ registers $,$ ALU, and control sections $2.$ A microprocessor system consists of a $.$ data, address, and control buses b $.$ a microprocessor $,$ memory, and $/$sections $.$ registers $,$ ALU, and control sections $3.$ A microprocessor communicates with the rest of a system through a $.$ data, address, and control buses b $.$ a microprocessor $,$ memory $,$ and $1/$ O sections $.$ registers, ALU, and control sections $4.$ The program counter a points to the next instruction to be executed b$.$ points to the data to be read from memory counts the number of bytes read from memory