Please select the statements which are correct for conversion of SAP ECC to SAP S/4HANA.
a) Data model change is optional in SAP S/4HANA
b) Both options – Universal Journal is mandatory change AND Most of the GUI transactions are still available for use in SAP S/4HANA
c) Universal Journal is a mandatory change in S/4HANA
d) Most of the GUI transactions are still available for use in SAP S/4HANA
e) System should be non-Unicode before conversion to SAP S/4HANA