Service Level Objectives (SLO) is the correct answer because it is a quantitative measure that represents the performance level that a cloud system or service is expected to achieve. When an auditor assesses the implementation of continuous auditing of performance on a cloud system, they need to review the SLOs to ensure that the system is meeting the established performance targets. On the other hand, Recovery Point Objectives (RPO) and Recovery Time Objectives (RTO) are related to disaster recovery and business continuity, rather than continuous performance auditing. Service Level Agreements (SLA) outline the overall contractual obligations between the cloud provider and the customer, including performance metrics, but are not a direct quantitative measure of system performance like SLOs.