Which three statements are correct concerning private address space?

Which three statements are correct concerning private address space? (Choose three.)

A.
Private address space is defined in RFC 1918.

B.
These IP addresses are considered private:
10.0.0.0 172.15.0.0 192.168.0.0

C.
Private address space is not supposed to be routed over the Internet.

D.
Using only private address space and NAT to the Internet is not considered as secure as having a stateful firewall.