Why is the Kronos batch number stored in the Interface table for EE remuneration info (PTEX2010) and in the employee remuneration info (PA2010)?

Why is the Kronos batch number stored in the Interface table for EE remuneration info (PTEX2010) and in the employee remuneration info (PA2010)?
A . To allow specific batches to be imported into CATS
B . To allow for easy reversal/deletion of transactions
C . To facilitate import into Employee Central time sheets
D . To identify transactions from a specific period

Answer: B,C