What can you include in the projection list of a Core Data Services (CDS) view? 3 ans

What can you include in the projection list of a Core Data Services (CDS) view? 3 ans
A . ABAP system fields such as sy-langu or sy-mandt / CI String constants and literal values
B . Aggregation functions over fields of ABAP Dictionary tables used in the FROM clause
C . A field from the structural output of an ABAP Managed Database Procedure used in the FROM clause
D . A field from the projection list of another CDS view used in the FROM clause

Answer: B,C,D