Choose the correct description for the following sudoku solving technique: Swordfish

A) For one digit, two rows that have candidates in exactly the same two columns form a rectangle; all other instances of that digit in those columns can be eliminated.

B) A four-cell pattern extending XYZ-Wing logic, where shared subsets among the pivot and pincers lead to elimination of a common candidate.

C) Four digits that each appear in only four cells of a house restrict those cells to those digits.

D) A 3x3 variant of X-Wing where three rows align with three columns, allowing eliminations outside intersections.
