You must create a custom VPC with a single subnet whose CIDR range is as large as possible. Which range should you use?

The 10.0.0.0/8 CIDR block provides the largest possible range for a single subnet within a custom VPC, encompassing 16,777,216 IP addresses. This is the largest private IP address range available from RFC 1918. While 0.0.0.0/0 represents all possible IP addresses, it is not a valid CIDR range for a VPC subnet as it includes public IP addresses and is typically used for default routes. The 172.16.0.0/12 and 192.168.0.0/16 ranges are also valid private IP ranges, but they offer fewer IP addresses (1,048,576 and 65,536 respectively) compared to 10.0.0.0/8.