To solve this question, the user needs to have knowledge about DNS suffix and Checkpoint VPN. The user needs to identify which DNS suffix is the default for Checkpoint VPN.
The correct answer is option A: enterprisenet.org. This is the default Checkpoint VPN DNS suffix. Checkpoint VPN is a software-based VPN client and firewall solution which uses DNS suffix to resolve domain names to IP addresses. The DNS suffix is added to the hostname when making a DNS query. In the case of Checkpoint VPN, the default DNS suffix is enterprisenet.org. Options B, C, and D are incorrect, as they are not related to Checkpoint VPN or its default DNS suffix.