A CloudOps engineer creates a new VPC that includes a public subnet and a private...

Each subnet in a VPC has a fixed CIDR range that determines how many private IP addresses are available. AWS reserves five IP addresses per subnet, reducing the usable address count. Once the available IP addresses are exhausted, no more instances can be launched in that subnet.

AWS does not allow changing the CIDR block of an existing subnet. Therefore, Option A is invalid. Option B does not increase the number of IP addresses; Availability Zones are properties of subnets, not expansions of their CIDR ranges. Option C is incorrect because Elastic IP addresses are public IPs and do not increase the number of private IP addresses available in a subnet.

The only viable solution is to create a new subnet with a larger or additional CIDR range and deploy additional EC2 instances there. This approach aligns with AWS VPC design principles and is the standard method for handling IP exhaustion.