Choose the correct description for the following sudoku solving technique: Hidden Quad

A) A 5x5 version of the fish pattern, applied to eliminate candidates outside the intersecting region.

B) If a single digit appears in exactly k rows and those candidates align in k columns (or vice versa), that pattern allows elimination of that digit from other positions outside the intersections.

C) If N cells in a house collectively contain exactly N candidates, those candidates can be eliminated from all other cells in that house.

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