When the flight crew need to review terrain with ND in center AP

When the flight crew need to review terrain with ND in center APP mode, no terrain data is displayed after pressing the TERRAIN switch on EFIS control panel. Then which of the following statement is correct?

A.Terrain data will be displayed if ND display mode is changed into expanded MAP mode.

B.Terrain data will be displayed if ND display mode is changed into expanded MAP mode and the TERRAIN switch on EFIS control panel is pressed again.

C.Terrain data will be displayed if ND display mode is changed into center APP mode.

D.Terrain date will be displayed only by pressing again the TERRAIN switch on EFIS control panel regardless of the display mode.

正确答案是A