Which two statements are true about Exadata memory capabilities?

Which two statements are true about Exadata memory capabilities?

A.
X3-8 can be purchased in a Half Rack configuration with 2 TB of memory.

B.
X3-2 memory can be expanded to 512 GB per node from 256 GB.

C.
X3-2 memory can be upgraded to use Flash in the compute nodes.

D.
X3-8 memory is fixed at 4 TB per a Rack.

E.
X3-2 can be purchased in a Half Rack configuration with 256 GB per node.

Explanation:
D: ORACLE EXADATA DATABASE MACHINE X3-8 features include:
160 CPU cores and 4 TB of memory for database processing
E: Database servers X3-2
A third generation was announced in 2012. Each Database Server with
2 x Eight-Core Intel Xeon E5-2690 Processors (2.9 GHz)
128 GB Memory (expandable to 256GB)