Note: The figures shown are representative.

To determine the pattern obtained after unfolding, we trace the reverse of the folding process:

1. First fold (Figure II): The square is folded diagonally along the top-left to bottom-right line, resulting in the upper-right right-angled triangle.

2. Second fold (Figure III): The resulting triangle is folded along its altitude from the right angle to the hypotenuse, forming the smaller isosceles triangle shown in Figure (IV).

3. Cuts (Figure IV): Triangular notches are cut along the outer edges of this folded triangle.

4. Unfolding (Figure IV $\rightarrow$ III $\rightarrow$ II $\rightarrow$ I):

   • Reflecting the cuts across the fold line of step (III) and then across the diagonal line of step (II) produces symmetric cutouts along all four outer edges (inward-pointing triangles at the midpoints of top, bottom, left, and right edges).

   • The internal cutouts reflect symmetrically across the diagonal axis of symmetry (top-left to bottom-right).

   • This corresponds precisely to the configuration in Option (A).