Answer:

The output of the assembler in machine codes is generally referred to as the object program.

Explanation:

An assembler is a program that converts the assembly language code into machine code that can be understood by the computer's processor. The assembler performs the conversion by translating the mnemonic instructions and symbolic labels of the assembly language into binary machine code instructions.

The output of the assembler is typically an object program, which consists of machine code instructions and data. The object program is a binary representation of the source program written in assembly language.

Object Program:

The object program is a machine-readable form of the source program. It contains the translated machine code instructions and data that can be directly executed by the computer's processor. The object program is usually stored in a file with an extension such as .obj or .o.

Source Program:

The source program, on the other hand, is the program written in assembly language. It contains mnemonic instructions, symbolic labels, and data directives that represent the desired operations to be performed by the computer. The source program is human-readable and serves as the input to the assembler.

Macro Instruction:

A macro instruction is a shorthand notation for a sequence of assembly language instructions. It allows the programmer to define reusable code snippets and include them in the source program using a single macro instruction. However, the output of the assembler is not referred to as a macro instruction.

Micro Instruction:

Micro instructions are low-level instructions that control the operations of a microprocessor. They are typically executed by a control unit, which interprets the micro instructions and generates the necessary control signals to perform the desired operations. The output of the assembler is not referred to as a micro instruction.

In conclusion, the correct answer is option B - Object program.