Which of the following is used by storage tiering to meet SLAs?

RBAC (Role-Based Access Control) is used in storage tiering to assign permissions that determine which users, applications, or service roles can access particular storage tiers, directly enforcing SLA requirements by ensuring high-priority workloads are mapped to the appropriate performance tier. This access-based governance is what storage tiering systems use to guarantee SLA compliance across differentiated tiers.

Rule sets are configuration constructs used in firewall or routing contexts and are not the governing mechanism for SLA-driven storage tier access.

Policies are broader management constructs and, while related to storage administration, are not the specific mechanism used to enforce SLA-based tier access in storage tiering systems.

Cron jobs are time-based task schedulers used for script automation and play no role in storage tiering SLA enforcement.