Evidence corroboration is achieved by

A.
Creating multiple logs using more than one utility.

B.
Establishing secure procedures for authenticating users.

C.
Maintaining all evidence under the control of an independent source.

D.
Implementing disk mirroring on all devices where log files are stored.

Explanation:
Corroborative evidence is supporting evidence used to help prove an idea or point.
It cannot stand on its own, but is used as a supplementary tool to help prove a primary piece of
evidence. – Shon Harris All-in-one CISSP Certification Guide pg 678