In House Paralegal, Dorothy, Is Asked by Her Company's Personnel

In house paralegal, Dorothy, is asked by her company's personnel department if the old email backup harddrive, which is failing, can be erased and disposed of. As the personnel department has nothing to do with corporate dealings with shareholders or other people outside of the company, Dorothy does not see the harm in letting that old information go. She is

A) probably correct because the email are only pertinent to internal matters.
B) probably wrong because the personnel department's email might be pertinent to a case brought by a current or fomer employee against the corporation.
C) probably correct because there is never any need to retain email. They are all preserved by the senders, anyway.
D) probably wrong because all email must be retained by every corporation for all time.