The diagram shows monochromatic light passing through two openings.

An illustration of monochromatic light striking an opening in a boundary and then going through two openings in a second boundary. The diverging light strikes a surface at 5 different points. The second is labeled X, and the fourth is labeled Y.
What do the areas labeled X and Y represent?
PLEASE CHOOSE ONE ANSWER.

constructive interference in which waves cancel each other out
constructive interference in which waves strengthen each other
destructive interference in which waves cancel each other out
destructive interference in which waves strengthen each other