Which of the following log files contains verbose information regarding the negotiation process and other encryption failures?

Answer D

https://sc1.checkpoint.com/documents/R76/CP_R76_CLI_WebAdmin/12467.htm

vpn debug

Description Instruct the VPN daemon to write debug messages to the VPN log file: in $FWDIR/log/vpnd.elg. Debugging of the VPN daemon takes place according to topics and levels. A topic is a specific area on which to perform debugging, for example if the topic is LDAP, all traffic between the VPN daemon and the LDAP server are written to the log file. Levels range from 1-5, where 5 means “write all debug messages”.