What is a tool that combines object files and libraries into one executable program called?

• A. Compiler
• B. Linker
• C. Assembler
• D. Interpreter

Answer: (B)

The tool that combines object files and libraries into one executable program is known as a linker. The linker plays a crucial role in the software development process by taking one or more object files generated by a compiler and resolving references between them to create a single executable file. This involves linking together various pieces of code and resources that might be defined across multiple source files and libraries, ensuring that functions, variables, and other identifiers are correctly connected.

When you write a program, it is typically split into various source files, each compiled separately into object files. The linker then merges these object files, ensures that all dependencies are resolved, and can include any necessary libraries to produce a complete executable that can run on a computer.

The other tools mentioned in the options serve different purposes: a compiler translates source code into object code, an assembler converts assembly language into machine code, and an interpreter directly executes instructions written in a programming language without compiling them into machine code first. Therefore, the linker is specifically tasked with assembling these compiled pieces into a functional application, making it the correct answer in this context.