To ensure that traffic from the guests is steered to the VM-Series firewall, what must be installed on each guest?

The correct choice involves the installation of VMware tools on each guest to ensure that traffic from the guests is properly steered to the VM-Series firewall. VMware Tools is a suite of utilities that enhances the performance of the virtual machine's guest operating system and improves management of the virtual machine.

By installing VMware Tools, the virtual machine can take advantage of features such as improved networking capabilities, which can facilitate proper communication between the virtual machine and the VM-Series firewall. This helps in ensuring that network traffic can be effectively routed and managed according to the security policies established within the deployment.

Other options, while valuable in their own contexts, serve different purposes. For instance, GlobalProtect is primarily used for enabling secure access to the network and VPN functionalities, but does not specifically handle the routing of traffic to the firewall. Cortex XDR is focused on extended detection and response for various endpoints, providing security insights and response capabilities but not directly facilitating traffic steering. The PAN-OS Terminal Agent is designed for specific management functions and not necessarily for ensuring that guest traffic is routed through the firewall.