Which configuration setting ensures that virtual networks on a virtual switch are isolated from each other?

Port ID is an internal identifier for a port on a virtual switch and does not provide network isolation between different virtual networks.

Network Label is a human-readable name assigned to a port group or virtual network, primarily for administrative organization and identification, not for enforcing network isolation.

Security Policy refers to settings like promiscuous mode, MAC address changes, and forged transmits, which control specific security behaviors of virtual network adapters but do not inherently provide isolation between virtual networks in the way VLANs do.

VLAN ID (Virtual Local Area Network Identifier) is the specific configuration setting used to logically segment a single physical network or virtual switch into multiple broadcast domains. By assigning different VLAN IDs to different port groups or virtual networks on a virtual switch, traffic is isolated, preventing communication between VMs in different VLANs without a router.