Final answer:
The correct answer is the Working set, which refers to the pages in memory that a process needs to access in a given period to execute efficiently without too many page faults.
Step-by-step explanation:
The subset of an address space's pages in central storage at a given time is known as the Working set. This term is used in computer science, especially in the context of operating systems, to describe the set of pages that a process has referenced in a brief period of execution or 'working window'. The working set model is a way to understand and predict the behavior of a program in a computer's memory in terms of the number of pages it needs to execute without causing too many page faults, which would slow down the process.