Given the customer's requirements for a storage solution in a VMware environment, with 20 TB of standard business data, 400 TB of video archive files, and a concern for cost, HPE MSA is the most cost-effective solution that meets these needs. HPE MSA offers affordable storage with enterprise features such as snapshots and replication. It supports iSCSI connectivity, which aligns with the customer's 10 GB iSCSI requirements. Additionally, MSA provides a balance of performance and capacity, making it a suitable choice for environments where budget is a primary concern.