Specifies the accessibility options for the DB instance. A value of true specifies an Internet-facing instance with a publicly resolvable
            DNS name, which resolves to a public IP address. A value of false specifies an internal instance with a DNS name that resolves to a private
            IP address. Default: The default behavior varies depending on whether a VPC has been requested or not. The following list shows the default
            behavior in each case. 
- Default VPC:true
- VPC:false
 Declaration Syntax
 Declaration Syntax| C# | 
public bool PubliclyAccessible { get; set; }