You have installed a new IPS license on your SRX device and successfully downloaded the attack signature
database. However, when you run the command to install the database, the database fails to install. What are
two reasons for the failure? (Choose two.)

A.
The file system on the SRX device has insufficient free space to install the database.

B.
The downloaded signature database is corrupt.

C.
The previous version of the database must be uninstalled first.

D.
The SRX device does not have the high memory option installed.

Explanation:
We don’t need to uninstall the previous version to install a new license, as we can update the same. Reference:
http://kb.juniper.net/InfoCenter/index?page=content&id=KB16491 . Also high memory option is licensed feature.
The only reason for failure is either there is no space left or downloaded file is corrupted due to incomplete
download because of internet termination in between. Reference: http://kb.juniper.net/InfoCenter/index?
page=content&id=KB23359