Explanation/Reference:
Explanation:
RAID level 1 is mirroring of drives. Data are written to two drives at once. 50% of the disks are used for fault tolerance.
Incorrect Answers:
A: RAID level 0, data striping, provides no fault tolerance.
C: RAID Level 2 uses parity for fault tolerance, but is not used in production today.
D: RAID level 5 uses one parity bit for fault tolerance. With three drives, the minimum amount, 33% of the disks are for fault tolerance.
References:
Harris, Shon, All In One CISSP Exam Guide, 6th Edition, McGraw-Hill, New York, 2013, p. 1270

It is the systems auditor that should lead the effort to ensure that the security controls are in place and effective. The audit would verify that the controls comply with polices, procedures, laws, and regulations where applicable. The findings would provide these to senior management.
The following answers are incorrect:
the local security specialist. Is incorrect because an independent review should take place by a third party. The security specialist might offer mitigation strategies but it is the auditor that would ensure the effectiveness of the controls the business manager. Is incorrect because the business manager would be responsible that the controls are in place, but it is the auditor that would ensure the effectiveness of the controls.
the central security manager. Is incorrect because the central security manager would be responsible for implementing the controls, but it is the auditor that is responsibe for ensuring their effectiveness.