What is Pauli-frame tracking?

Question: In fault-tolerant quantum computation, what is the main idea of Pauli-frame tracking? A) Physically apply every Pauli correction immediately after each syndrome measurement B) Store pending Pauli corrections classically and reinterpret later gates or measurement outcomes accordingly C) Replace the stabilizer code with a classical repetition code D) Estimate the average fidelity of a noisy Pauli channel Correct: B Explanation: Instead of immediately applying every Pauli correction on hardware, one can update a classical record of the current Pauli frame. This can reduce circuit depth and physical error exposure, but later operations and measurements must be interpreted consistently with the tracked frame. Topic: advanced quantum computing / fault tolerance / Pauli frame