Here,s why the other options are features of VCNs:
A). Assigning private IP address spaces: VCNs let you define custom private IP address ranges for your resources within the network, ensuring they remain hidden from the public internet.B. Creating subnets and route tables: Subnets within a VCN segment your network logically, improving organization and security. Route tables define how traffic flows within and outside the VCN.C. Configuring stateful firewalls: Stateful firewalls offer granular control over inbound and outbound traffic, protecting your resources from unauthorized access.VCNs are specifically designed to create private, isolated networks within OCI. All data within a VCN, by default, is not publicly accessible. To make resources publicly available, you,d need to configure additional services like internet gateways or load balancers, ensuring controlled access while adhering to security best practices.