Which of the following protocols are supported for AWS VPN connections

Answer options:

A.IPSec
B.OpenSSL
C.AES
D.DES

Answer - A
The AWS documentation mentions the following
Although the term VPN connection is a general term, in the Amazon VPC documentation, a VPN connection refers to the connection between your VPC and your own network. AWS supports Internet Protocol security (IPsec) VPN connections.
For more information on VPN connections, please visit the below link:
http://docs.aws.amazon.com/AmazonVPC/latest/UserGuide/VPC_VPN.html