Which of the following tiers addresses risks from an information system perspective?

Tier 0 is not a standard tier in most established risk management frameworks like NIST RMF.

Tier 3 in risk management frameworks, such as NIST RMF, focuses on the "Information System" level. This tier deals with the security controls, policies, and procedures directly implemented on individual information systems and applications to manage their specific risks.

Tier 2 typically addresses risks from a "Mission/Business Process" perspective, focusing on how systems support organizational functions and associated risks.

Tier 1 typically addresses risks from an "Organization-wide" perspective, focusing on governance, strategic objectives, and enterprise-level risk management.