In a stack, where are elements added and removed from?

In a stack, elements are added and removed from the top. This structure is known as "Last In, First Out" (LIFO), meaning that the last element added to the stack is the first one to be removed. When you push an element onto a stack, you place it on top of the current elements, and when you pop an element from the stack, you also remove the one that is at the top. This behavior ensures that the most recently added items are processed before those that were added earlier, making the top the primary point of interaction with the data. Therefore, the correct answer highlights the operational principles that define a stack's functionality in data management and structure.