Final answer:
The logical breakup of a Virtual Network is known as a SubNet, which is used to organize and manage network traffic by creating smaller interconnected networks within a larger one.
Step-by-step explanation:
The logical breakup of a Virtual Network is known as a SubNet (option c). A subnet, or subnetwork, is a segmented piece of a larger network. The purpose of a subnet is to split a large network into a group of smaller, interconnected networks to help organize and improve the flow of network traffic. Subnetting allows network administrators to create multiple logical networks within a single physical network. Different virtual machines (VMs), like those managed with Hyper-V or VMware, can be assigned to different subnets based on their functions, security requirements, or administrative policies.