Final answer:
A page-mode property holds a list of pages, while a page group contains a group of related pages; both are essential in data management and relational database organization in computer science.
Step-by-step explanation:
A page-mode property refers to option c) A property that stores a list of pages. In the context of computer science and databases, this type of property is instrumental in organizing and storing data objects that consist of multiple related records or entries, each represented as a separate page within a larger structure or 'list of pages'. This enables the system to manage complex data relationships and hierarchies more efficiently. Similarly, a page group corresponds to option d) A property that stores a group of related pages, which is used to categorize and manage pages that share common attributes or purposes within a database or programming environment.