A User Has Created a VPC with CIDR 20

Multiple Choice

A user has created a VPC with CIDR 20.0.0.0/16 with only a private subnet and VPN connection using the VPC wizard. The user wants to connect to the instance in a private subnet over SSH. How should the user define the security rule for SSH?

A) The user can connect to a instance in a private subnet using the NAT instance
B) The user has to create an instance in EC2 Classic with an elastic IP and configure the security group of a private subnet to allow SSH from that elastic IP
C) Allow Inbound traffic on port 22 from the user's network
D) Allow Inbound traffic on port 80 and 22 to allow the user to connect to a private subnet over the internet