Neeraj folds a square sheet along one diagonal (lower-left half up) and then along the other diagonal, which leaves a small triangle. He punches a triangle pointing up and a round hole. Which figure shows the sheet opened out?

Undo the second diagonal fold: twins mirrored across the top-right to bottom-left diagonal, where a triangle pointing up turns to point right. Undo the first: all four mirrored across the other diagonal, where up and left swap and right and down swap. Eight holes: (d).