B.On 22 September 2022, the Japanese yen fell to 145 per dollar, its lowest level in 24 years. Japan's central bank (BoJ) intervened in the FX market and pushed the yen back up to 142 per dollar, a rebound of 2.1%, within hours. How did the BoJ manage to push up the yen exchange rate so quickly? Explain all the possible intervention it could have done, not just what it actually did