What is the minimum number of served licenses required for a customer with 5 datazones...

The minimum number of served licenses required for a customer with 5 datazones and 2 additional storage nodes per datazone is 7. This is because each datazone requires a minimum of 1 served license, and each additional storage node requires an additional served license. The other options are not related to this process.

References: [1] https://www.dell.com/support/manuals/us/en/04/dell-emc-data-domain-dd3300/data-domain-dd3300-user-guide/dd-licensing?guid=guid-e8d6f2f7-e9a1-4e9b-92f2-d2cfc541c821 &lang=en-us [2] https://www.dell.com/support/article/en-us/sln310985/dell-emc-data-domain-dd3300-minimum-number-of-served-licenses?lang=en