Which two SRX platforms support UTM features?

First, UTM need high memory, so A is incorrect and B is correct

Second, according http://kb.juniper.net/InfoCenter/index?page=content&id=KB15413&actp=search&viewlocale=en_US&searchid=1306555835375
“SRX110, SRX220, SRX550 and SRX650 only come in high memory versions.”

That mean “juniper have not “SRX650 with base memory” product”, so C is incorrect.

According, http://kb.juniper.net/InfoCenter/index?page=content&id=KB15413&actp=search&viewlocale=en_US&searchid=1306555835375
“Base memory versions have 512MB of memory and the high memory versions have 1GB of memory.”

and “http://www.juniper.net/us/en/local/pdf/datasheets/1000336-en.pdf”

SRX1400 is 1GB, so D is correct

ps. i cant find any SRX 1400 with base memory information…