Choose the appropriate and cheapest license for Apex

Dear Experts,
If a customer likes Oracle Apex and want his system to be built with this technology on his private server but he has problems in expensive license of Oracle Database compared with MS SQL Server.
If the customer has:
- Planned No. of users: 25 user - max of 10 concurrent users.
- Server Processor: Intel Xeon(R) CPU X3440 @ 2.53GHz 2.53GHz - 64bit
- Server RAM:  4GB (I think it is too low for his number of users)
I have the following questions:
1) What is the cheapest and appropriate Oracle Database License to buy for this customer to build Oracle Apex system for his users?
2) What are the cheapest and recommended upgrades in the server processor and RAM in order to provide a good performance for the system with that number of users?
Best Regards
Mahmoud

Dear Scott,
Thank you for reply. If we look at:
Comparison between Oracle Database 12c Editions
We will find the following features not available in Express Edition compared to Standard Edition One
1) High Availability - Fail Safe
2) High Availability - Server Managed Backup and Recovery
3) Performance and Scalability - Integrated Clusterware
4) Security Defense In Depth - Proxy Authentication
5) Application Development - Oracle Flashback Data Archive
6) Application Development - SQL Pattern Matching
7) Application Development -  Temporal Database
8) Application Development - Java Support
9) Manageability - Oracle Enterprise Manager
10) Manageability - Oracle Automatic Storage Management
11) Integration - Based Replication
12) Unstructured Data Management - Multimedia
13) RAM - 1GB
- Do I need to plan for some of those features in the first or second release of system? especially those related to backup?
- Is RAM 1 GB too low for good performance according to the number of concurrent users?
- Do I need to upgrade or replace the Server HW specially processor to have a good performance or upgrading RAM only is enough?
Regards
Mahmoud

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