The customer's key requirements are a disaster recovery solution using SnapMirror where the destination is fully managed by the cloud provider. Amazon FSx for NetApp ONTAP is a first-party, native AWS service. This means AWS fully manages the ONTAP software and underlying infrastructure, abstracting the operational burden from the customer. It provides the full feature set of ONTAP, including native SnapMirror capabilities, making it an ideal DR target for on-premises ONTAP systems. This service directly aligns with the customer's request for a cloud-provider-managed SnapMirror destination.

A. Azure NetApp Files: While this is a service managed by the cloud provider (Microsoft), it is a file service that abstracts the underlying ONTAP, offering a subset of features through the Azure portal. FSx for ONTAP provides the full ONTAP experience.

B. NetApp Cloud Volumes Service: This service is managed by NetApp, not by the cloud provider (AWS or GCP). This contradicts the core requirement of the destination being managed by the cloud provider.

C. NetApp Cloud Volumes ONTAP: This is a customer-managed solution. The customer is responsible for deploying, managing, and maintaining the ONTAP software on cloud infrastructure, which is the opposite of the stated requirement.

1. Amazon FSx for NetApp ONTAP Documentation: "Amazon FSx for NetApp ONTAP is a storage service that allows customers to launch and run fully managed ONTAP file systems in the AWS Cloud... You can use NetApp SnapMirror to replicate data from an on-premises NetApp file system to an Amazon FSx for NetApp ONTAP file system."

Source: AWS Documentation, "What is Amazon FSx for NetApp ONTAP?", and "Accessing data from on-premises using SnapMirror".

2. NetApp Cloud Portfolio Documentation: NetApp's official documentation distinguishes the management models. It describes Amazon FSx for NetApp ONTAP and Azure NetApp Files as first-party services managed by the respective cloud provider. In contrast, it defines Cloud Volumes ONTAP as customer-managed and Cloud Volumes Service as NetApp-managed.

Source: NetApp, "TR-4799: Azure NetApp Files Disaster Recovery with NetApp Cloud Backup Service", Section 1.1 "NetApp Cloud Portfolio". This technical report outlines the different management responsibilities for each cloud service.

3. NetApp Cloud Volumes ONTAP Documentation: "Cloud Volumes ONTAP is a software-only storage appliance that runs the ONTAP data management software in an AWS, Azure, or Google Cloud environment. You have full control of the ONTAP software and the underlying cloud infrastructure."

Source: NetApp Cloud Volumes ONTAP Documentation, "Learn about Cloud Volumes ONTAP". This confirms the customer-managed nature of the service.