When configuring a virtual interface with Direct Connect , which of the following is false when it comes to the configuration of BGP with the virtual interface

Answer options:

A.If a public ASN is being used , then it must be ensured that you own the ASN.
B.If a private ASN is used , it must be in the 64512 to 65535 range
C.A BGP session needs to have a public or private ASN number at the customer side.
D.Autonomous System (AS) prepending can work even if you use a private ASN for a public virtual interface.

Answer - D
The AWS documentation mentions the following
A virtual interface must have a public or private Border Gateway Protocol (BGP) Autonomous System Number (ASN) for your side of the BGP session. If you are using a public ASN, you must own it. If you are using a private ASN, it must be in the 64512 to 65535 range. Autonomous System (AS) prepending does not work if you use a private ASN for a public virtual interface. You can provide your own MD5 BGP authentication key, or you can let Amazon generate one for you.
For more information on Virtual interfaces, please visit the below link:
http://docs.aws.amazon.com/directconnect/latest/UserGuide/WorkingWithVirtualInterfaces.html