Which statement is true about how route tables are used in Oracle Cloud Infrastructure (OCI) Virtual Cloud Network (VCN) and private subnets?

In Oracle Cloud Infrastructure, each subnet within a VCN can have multiple route tables associated with it. This is achieved through the use of route table attachments. While a subnet has one route table actively in use at any given time, administrators can create multiple route tables and switch between them as needed for different routing requirements. This flexibility allows for complex networking scenarios and dynamic routing configurations.

A. Route tables are used in both public and private subnets, not exclusively in public subnets.
B. Route tables can be fully customized by users; Oracle provides default tables but allows complete user control.
C. Private subnets typically don't have default routes to the Internet; they require explicit configuration through NAT gateways.

1. Oracle Cloud Infrastructure Documentation - Networking Overview, Section "Route Tables", Doc ID: E96279-01

2. OCI Virtual Networking Service Guide, Chapter 3 "Managing Route Tables", Version 21.4.1, Pages 45-48

3. Oracle University Course Materials - "OCI Architect Associate", Module 4: Networking, Section 4.3

4. Oracle Cloud Infrastructure Concepts Guide, "VCN Route Tables and Rules", Doc ID: E97862-02

5. OCI Best Practices Framework - Network Architecture, Section 2.3 "Subnet Routing Design"