Which of the following statements best describes how core data services (CDS) are developed?
1) They are developed in the ABAP layer of the SAP S/4HANA system by the Analytics end user.
2) They are developed in the ABAP layer of the SAP S/4HANA system by the IT user.
3) They are developed in the SAP HANA database layer by the Analytics key user.
4) They are developed in the SAP HANA database layer by the IT user.