What can potentially cause errors when you upload a Microsoft excel file into an SAP Ariba Sourcing event?

You are creating event content in Microsoft excel.

What can potentially cause errors when you upload a Microsoft excel file into an SAP Ariba Sourcing event? Note: there are 3 correct answers to this question.
A . Adding new rows
B . Editing the column headers
C . Sorting and filtering the excel file
D . Creating a system ID for new rows
E . Editing the tab labels

Answer: C, D, E