Which rules does SAP recommended to improve the performance of ABAP report on SAP HANA? There are 2 correct answers to this question.

Which rules does SAP recommended to improve the performance of ABAP report on SAP HANA? There are 2 correct answers to this question.
A . Use SELECT FOR ALL ENTRIES instead of a nested SELECT statement
B . Use array variants of INSERT UPDATE MODIFY and DELETE
C . Use a nested SELECT statement instead of SELECT FOR ALL ENTRIES
D . Perform all calculations and aggregations in the ABAP layer

Answer: B,C