On the FMC CDU, how is the MOD CRZ CLB page automatically displayed?
A.A. Entering a higher CRZ ALT on line 1L of the CRZ page
B.B.Pressing the CLB Mode Key during cruise
C.C.Entering a higher cruising altitude in the STEP TO line on the CRZ page
D.D.All of the above are correct.
正确答案是A