Final control to the programmer

The correct answer for the question is option 'A', linker. Let's understand why the linker gives the final control to the programmer.

Compiler
A compiler is a software tool that converts the high-level programming language into machine code or low-level language that can be directly executed by the computer. The compiler performs various tasks such as lexical analysis, syntax analysis, semantic analysis, code optimization, and code generation. However, the compiler does not provide the final control to the programmer.

Locator
A locator is a tool that assigns memory addresses to the different parts of a program during the linking process. It resolves the external references and generates a relocatable file that can be executed. However, the locator does not give the final control to the programmer.

Simulator
A simulator is a software tool that mimics the behavior of a system or process. It provides an environment where the programmer can test and debug the code without actually executing it on the target system. While the simulator is useful for testing and debugging, it does not give the final control to the programmer.

Linker
A linker is a software tool that combines multiple object files generated by the compiler into a single executable file. It resolves the references between different object files, resolves external symbols, and performs address relocation. The linker is responsible for combining all the necessary components of a program and generating an executable file that can be directly executed by the computer.

Final control to the programmer
The linker gives the final control to the programmer because it allows them to define the structure of the program and specify how different modules and libraries should be linked together. The programmer can control the order of linking, specify the libraries to be linked, and resolve any external references. This gives the programmer the ability to customize the execution of the program and ensure that all the necessary components are included.

In conclusion, among the given options, the linker is the tool that gives the final control to the programmer.