The loss of one DEU results in activation of the EEC′s alternate

The loss of one DEU results in activation of the EEC′s alternate mode. What is correct?

A.A.The EEC′s automatically switch into hard mode and the engines might overboost

B.B.The soft alternate mode is entered first, using last valid flight conditions to define engine parameters

C.C.If the thrust levers are reduced the hard mode is entered and last valid flight conditions will be used for the engine parameters

D.D.You can only enter the hard mode by manually selecting it on the engine control panel

正确答案是B