Which one of the following is not an application software ?

Software is broadly classified into system software and application software. Application software is designed to perform specific tasks for the end user, such as creating documents or managing data. Examples include spreadsheets (like Microsoft Excel), presentation software (like MS PowerPoint), and graphic design or CAD tools like AutoCAD. In contrast, system software supports the computer's operation and manages hardware resources. A linker is a type of system software (specifically a language processor or utility) that combines various object files generated by a compiler into a single executable file. While spreadsheets and PowerPoint are productivity applications used directly by users to solve problems, a linker works in the background to facilitate the execution of programs, making it system software rather than application software.