Final answer:
b. file explorer. File Keeper is not a recognized standard file management software for PCs in comparison to File Explorer, Finder, and File Manager, which are default tools of major operating systems.
Step-by-step explanation:
The question asks which of the listed options is not an example of software that helps manage files on personal computers (PCs). To answer this, let's look at each option: File Explorer is a file management application in Windows that allows users to manage and locate their files. Finder serves a similar purpose for macOS systems.
File Manager is a general term that could refer to any software designed to organize and manage files on a computer, including specific applications for various operating systems.
However, File Keeper is not a commonly recognized file management software, and it doesn't correspond to the default file management tools provided in major operating systems like Windows or macOS. Therefore, the answer is File Keeper, as it is not a standard PC file management software.