Which product is part of the network security offerings from Sophos?

The choice of a firewall as part of the network security offerings from Sophos is accurate because firewalls are critical components in protecting network infrastructure. They serve as a barrier between trusted internal networks and untrusted external networks, controlling incoming and outgoing traffic based on predetermined security rules. Sophos offers advanced firewall solutions that integrate various security features, such as intrusion prevention, VPN support, and web filtering, making them essential tools for safeguarding against a wide range of cyber threats.

Other options, such as a virtual machine, database, and application server, do not specifically fit into the category of network security products. While they are vital elements in IT environments, their primary functions center around computing resources, data storage, and application management rather than providing security features like those offered by firewalls. Thus, the firewall stands out as the relevant choice in the context of network security from Sophos.