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In Salesforce, the Role Hierarchy grants record access to users higher in the hierarchy. If the operations users are below the operations manager in the Role Hierarchy and the object’s organization-wide default (OWD) is not "Private," the manager will inherit access to records owned by their subordinates. This approach is automatic and does not require additional sharing rules or groups.

Option A: Ownership-based sharing rules are unnecessary if the Role Hierarchy provides the required access.

Option C: Using a Public Group is an unnecessary workaround for this scenario when Role Hierarchy fulfills the requirement.