In the Junos OS, which type of file dumps the program’s environment in the form of memory
pointers, instructions, and register data to a file in the event of a panic or other serious
malfunction?

A.
log file

B.
backup file

C.
configuration file

D.
core file

Explanation:
Junos will under a panic create a core-dump file, definitely not a backup file.
> show system core-dumps
/var/crash/*core*: No such file or directory
/var/tmp/*core*: No such file or directory
/var/tmp/pics/*core*: No such file or directory

/var/crash/kernel.*: No such file or directory
/tftpboot/corefiles/*core*: No such file or directory