What are the implications regarding the change request?

You upload a file with new or changed master data.

What are the implications regarding the change request? There are 2 correct answers to this question.
A . A change request can be created at the end of the upload
B . Multiple change request will be created depending on configuration and file size
C . A change request must be created pr or to the start of the upload
D . Objects already in a change request will be updated to the same

Answer: B,C