You have been engaged by your client to lead the migration of their application infrastructure to GCP. One of their current problems is that the on-premises high performance SAN is requiring frequent and expensive upgrades to keep up with the variety of workloads that are identified as follows: 20 TB of log archives retained for legal reasons; 500 GB of VM boot/data volumes and templates; 500 GB of image thumbnails; 200 GB of customer session state data that allows customers to restart sessions even if off-line for several days. Which of the following best reflects your recommendations for a cost-effective storage allocation?

The correct option leverages appropriate GCP services for each workload. Memcache backed by Cloud Datastore is ideal for customer session state data, offering low-latency access and persistence for sessions that need to resume after several days. Cloud Storage with lifecycle management is a cost-effective solution for log archives (infrequently accessed, long retention), image thumbnails (static, accessible), and VM boot/data volumes (can be stored as images/snapshots). Local SSD is too volatile and expensive for persistent session state data. Cloud SQL is a relational database and overkill for simple key-value session data. Persistent Disk SSD is also more expensive and less optimized for session state than Datastore. Using local SSD-backed instances for VM boot/data volumes is not cost-effective for 500GB of static data; Cloud Storage is better for storing and managing these.