When a pop() operation is called on an empty queue, what is the condition called?a.syntax errorb.garbage valuec.overflowd.underflow

Answering the Question

When a pop() operation is attempted on an empty queue, it leads to a specific condition in data structure terminology. In this case, the correct term used to describe the situation where we're trying to remove an element from an empty structure is referred to as "underflow."

Therefore, the answer is:

d. underflow

Underflow occurs when an operation is attempted on an empty data structure, indicating that there are no items to retrieve or manipulate. In queue operations, this situation needs to be handled appropriately to avoid errors or crashes in software applications.