In which queuing discipline do entities leave the queue in reverse order from which they arrive?

The correct answer is based on the understanding of how entities are managed in a queue. In a First-In/Last-Out (FILO) queuing discipline, the last entity to arrive in the queue is the first one to be processed and leave the queue. This essentially means that items exit in reverse order of their arrival.

To visualize this, imagine a stack of plates; the last plate placed on top is the first one to be taken off. This characteristic of FILO is crucial in scenarios where the most recent item needs to be addressed before the older items.

This concept is often contrasted with other queuing disciplines such as FIFO, where the first item to arrive is the first to be processed, or LIFO (Last-In/First-Out), which is essentially synonymous with FILO but may be used in different contexts. Each of these terms reflects distinct strategies for handling entities in a queue, but FILO specifically emphasizes the reversal of the order in which entities exit compared to their entrance.