The "Reviewer & Approver" role is recommended when a user needs to do more than just provide feedback. This role uniquely grants the ability to make a formal decision on the proof (e.g., Approved, Changes Required, Not Relevant). This decision acts as a definitive summary of their overall feedback (B) and serves as a formal mechanism to indicate that their review is complete, even if no specific comments or markups were added (A). A standard "Reviewer" can only add comments and cannot make these binding decisions.

C. This is incorrect because the standard "Reviewer" role also allows for making comments and markups; this capability is not exclusive to the "Reviewer & Approver" role.

D. Notifications are configured within the proof's workflow settings and are not a primary function or reason for assigning a specific user role like "Reviewer & Approver."

1. Adobe Workfront Documentation, "Proof roles overview." This document explicitly outlines the capabilities of each role. It states that both "Reviewer" and "Reviewer & Approver" can "Make comments and markups," invalidating option C. It also specifies that only roles with "Approver" permissions can "Make a decision on the proof," which directly supports options A and B as the key differentiator.

2. Adobe Workfront Documentation, "Make a decision on a proof in the proofing viewer." This guide details the decision-making process for approvers. It states, "As an approver on a proof, you must make a decision on the proof to indicate whether it's ready for the next step in its lifecycle." This confirms that making a decision is the formal method for an approver to complete their review and summarize their findings, supporting the reasoning for answers A and B.