Which of the following days is an examination holiday?

Christmas Day is recognized as an examination holiday due to its status as a public holiday, during which many institutions and organizations are closed, and no examinations are typically scheduled. This day is widely celebrated around the world, and educational institutions often observe it by halting classes and exam activities.

On the other hand, Valentine's Day is generally not a recognized holiday in academic settings, focusing more on romantic celebration rather than academic observance. Labor Day, while significant as a public holiday honoring laborers, does not specifically correlate with examination schedules in educational systems. New Year's Eve Day, although a widely celebrated occasion, also does not serve as an examination holiday since it represents the transition into the new year rather than a formal observance that would affect academic calendars. Thus, Christmas Day stands out as the day most universally acknowledged as an examination holiday.