Which of the following statements regarding the architecture of SAP NetWeaver AS are correct? There are 2 correct answers to this question.

Which of the following statements regarding the architecture of SAP NetWeaver AS are correct? There are 2 correct answers to this question.
A . The central services instance of the AS Java is required only for an AS Java installation, and not for an AS ABAP+Java (Dual Stack) installation.
B . SAP NetWeaver-based SAP systems use either AS ABAP, AS Java, or AS ABAP+Java (Dual Stack).
C . All SAP NetWeaver-based SAP systems can be installed as AS ABAP+Java (Dual Stack) systems.
D . With AS ABAP+Java (Dual Stack), the AS Java and AS ABAP use different database schemas.

Answer: B,D