What solving technique applies to the following Sudoku situation?
"Bivalue cells r4c4 and r8c9 are {5,9} and are connected by a strong link on 9 in column 8; eliminate 5 from any cell that sees both r4c4 and r8c9.

A) XYZ-Wing

B) Hidden Triple

C) Swordfish

D) W-Wing
