Correct Answer: A, DTo create a fully redundant connection from an on-premises data center to a Virtual Cloud Network (VCN) in the us-ashburn-1 region, one effective approach is to configure two FastConnect virtual circuits to the us-ashburn-1 region and ensure they terminate in diverse hardware on-premises. This ensures that even if one circuit or piece of hardware fails, the other will maintain the connection. Another viable option is to configure one FastConnect virtual circuit to the us-ashburn-1 region and supplement it with a Site-to-Site VPN to the same region. This setup leverages different technologies for redundancy, ensuring that even if one method of connection fails, the other remains operational. Combining these two methods provides robust redundancy for the connection.