12 In the U.S. Supreme Court case, Graver Tank & Mfg. Co. v. Linde Air Prods., Inc., the court held
that “a patentee may invoke this doctrine to proceed against the producer of a device ‘if it performs substantially the same function in substantially the same way to obtain the same result.’” Which of the following is “this doctrine” referring to?
(A) All elements rule.
(B) The doctrine of equivalents.
(C) TSM test.
(D) The doctrine of exhaustion.