A VLAN (also known as a Virtual Lan) is defined as a domain that is isolated and partitioned inside a computer network. The native VLAN is the only VLAN in a trunk that is not tagged, meaning any untagged traffic (or frames) that is received on a trunk port will be put here.
Both sides of the trunk link are required to be configured in the same native VLAN. Therefore, two characteristics that describe a native VLAN are that the native VLAN provides a common identifier to both ends of a trunk, and the native VLAN traffic will be untagged across the trunk link.
Option A and B are correct
The native VLAN provides a common identifier to both ends of a trunk; the native VLAN traffic will be untagged across the trunk link are two characteristics that describe the native VLAN