Suppose that the price GBP in terms of DEM (Deutsche marks) fell below the lower limit under the 'snake in the tunnel' policy (before the adoption of the Euro as the common currency). Under that policy, which of the following statement would have been correct? The German central bank would sell DEM and buy GBP to push the rate above the upper limit The German central bank would sell GBP and buy DEM to push the rate above the lower limit The German central bank would sell GBP and buy DEM to push the rate below the lower limit The German central bank would sell DEM and buy GBP only if the Bank of England approved