In which of the following scenarios is a stack primarily used?

A stack is a data structure that operates on a last-in, first-out (LIFO) principle, meaning that the most recently added element is the first one to be removed. This characteristic makes stacks particularly suitable for situations where you need to keep track of recent actions or states, as they allow for easy access to the most recent item.

In the context of managing browser history, when a user navigates between pages, the most recent pages visited are pushed onto the stack. If the user wants to go back to the previous page, the browser simply pops the top item from the stack, allowing users to easily navigate backward in their history. This LIFO structure is perfect for capturing the sequence of visited pages and enables quick retrieval of the last page viewed.

The other scenarios, while they involve different data structures or methods more suitable for their respective tasks, do not take advantage of the LIFO behavior characteristic of stacks. For instance, maintaining order in ticketing systems may involve queue structures or priority queues, sorting database records typically requires algorithms that organize data in non-linear ways, and scheduling tasks generally uses certain prioritized structures or timers for management. Each of these requires handling data differently than what stacks are designed to do, making browser history management the ideal scenario for