Geometry

Question Analysis:
This question tests recognition of point pairs that are mutual reflections across y = x.
The main focus is on checking if the coordinates are true swaps.

Key Concept Explanation:
If point A is (x, y), its reflection across y = x is (y, x).
Thus, any pair of points that are each other’s coordinate swaps are valid.

Step-by-Step Solution:
A. (8, -1) and (-1, 8) → ✔️ Yes, (x, y) → (y, x)
B. (2, 5) and (5, 2) → ✔️ Perfect swap.
C. (-3, 6) and (-6, 3) → ❌ Not correct swap → (should be (6, -3))
D. (4, 4) and (4, 4) → ✔️ On the line y = x; remains unchanged....