Solution

A Storage Area Network (SAN) is the most suitable storage solution for mission-critical applications in a virtualized environment that demands high availability and scalability. SANs provide block-level storage that can be accessed by virtual machines through the hypervisor with minimal latency, making them ideal for high-performance applications. SANs also offer redundancy and fault tolerance through features like RAID, ensuring continuous availability even in the event of hardware failures. SAN's ability to easily scale and provide fast data access makes it superior for enterprise-level workloads. Why Other Options are Incorrect: A) Direct Attached Storage (DAS): DAS is connected directly to a server and lacks the flexibility and scalability of SANs. It is not suited for large-scale virtualization environments requiring high availability. B) Network Attached Storage (NAS): NAS provides file-level storage over a network, which is typically slower than block-level storage and may introduce latency in virtual machine operations. D) Cloud Object Storage: While scalable, cloud object storage is often not ideal for low-latency, high-performance workloads typical of mission-critical applications in a virtualized environment. E) Virtual Storage Appliance (VSA): VSA offers software-defined storage but lacks the robustness and scalability of dedicated SAN infrastructure, especially for high-performance applications.