The of the os contains thousands of reusable components that provide functions ranging from file and folder manipulation to accessing i/o devices, starting and stopping programs, and creating, moving, and resizing gui window

Service layer of the OS (operating system).

Explanation:

As the exercise details, the service layer contains housands of reusable components that provide functions ranging from file and folder manipulation to accessing I/O devices, starting and stopping programs, and creating, moving, and resizing GUI window.  The service layer is generally meant for low level network communication, whilst it ensures protection and security.

the question deals with financial planning and the answer is that dan did not stay on budget due to the fact that this guy needs to start decreasing his discretionary spending. according to the financial plan, he needed to balance his expenses and resources.