Which features prevent the SAP HANA-optimization of transformations in the SAP HANA database? (2)

Which features prevent the SAP HANA-optimization of transformations in the SAP HANA database? (2)
A . Transfer routine on the characteristic level
B. ABAP expert routine in the transformation
C. ABAP end routine in the transformation
D. Lookup master data in the transformation

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Answer: B,C