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You are responsible for deploying a PHP application on Google App Engine Standard environment, which interacts with a Cloud SQL backend. The goal is to optimize the application's performance by minimizing the number of direct queries to Cloud SQL. What should you do to achieve this while leveraging caching mechanisms?
A
Set the memcache service level to dedicated. Create a key from the hash of the query, and return database values from memcache before issuing a query to Cloud SQL.
B
Set the memcache service level to dedicated. Create a cron task that runs every minute to populate the cache with keys containing query results.
C
Set the memcache service level to shared. Create a cron task that runs every minute to save all expected queries to a key called 'cached_queries'._
D
Set the memcache service level to shared. Create a key called 'cached_queries', and return database values from the key before using a query to Cloud SQL._