Which SLT objects are used during replication from both ABAP and non-ABAP systems?

You are explaining the architectural concept of Central Finance to a customer.

Which SLT objects are used during replication from both ABAP and non-ABAP systems? Note: There are 2 correct answers to this question.
A . Logging table
B . Mapping and Transformation engine
C . Reading engine
D . Database trigger

Answer: B, D