A User Has Created a VPC with Public and Private

A user has created a VPC with public and private subnets using the VPC wizard. Which of the below mentioned statements is true in this scenario?

A) The user has to manually create a NAT instance
B) The Amazon VPC will automatically create a NAT instance with the micro size only
C) VPC updates the main route table used with the private subnet, and creates a custom route table with a public subnet
D) VPC updates the main route table used with a public subnet, and creates a custom route table with a private subnet