For $S = \{(1, 5), (2, 10), (3, 15), (4, 20)\}$, the inverse relation $S^{-1}$ = ?

Question

Accepted Answer

$\{(5, 1), (10, 2), (15, 3), (20, 4)\}$

Answer

$\{(1, 5), (2, 10), (3, 15), (4, 20)\}$

Answer

$\{(1, 1), (2, 2), (3, 3), (4, 4)\}$

Answer

$\{(5, 4), (10, 3), (15, 2), (20, 1)\}$

For S={(1,5),(2,10),(3,15),(4,20)}S = \{(1, 5), (2, 10), (3, 15), (4, 20)\}S={(1,5),(2,10),(3,15),(4,20)}, the inverse relation S−1S^{-1}S−1 = ?