You have been asked to design network connectivity between your existing data centers and AWS. Your application`s EC2 instances must be able to connect to existing backend resources located in your data center. Network traffic between AWS and your data centers will start small, but ramp up to 10s of GB per second over the course of several months. The success of your application is dependent upon getting to market quickly. Which of the following design options will allow you to meet your objectives?

Answer options:

A.Quickly create an internal ELB for your backend applications, submit a Direct Connect request to provision a 1 Gbps cross-connect between your data center and VPC, then increase the number or size of your Direct Connect connections as needed.
B.Allocate EIPs and an Internet Gateway for your VPC instances to use for quick, temporary access to your backend applications, then provision a VPN connection between a VPC and existing on-premises equipment.
C.Provision a VPN connection between a VPC and existing on-premises equipment, submit a Direct Connect partner request to provision cross-connects between your data center and the Direct Connect location, then cut over from the VPN connection one or more Direct Connect connections as needed.
D.Quickly submit a Direct Connect request to provision a 1 Gbps cross-connect between your data center and VPC, then increase the number or size of your Direct Connect connections as needed.

Answer - C
The most important considerations in this scenario are: (1) the network traffic would be initially small, and will increase in the future, and (2) the application should be up quickly. So time is crucial. One thing should be noted that it takes time initially to set up the AWS Direct Connect (See the link below for the latest information).
https://docs.aws.amazon.com/directconnect/latest/UserGuide/getting_started.html
Option A is incorrect because setting up Direct Connect will take time. So, the backend servers will not be connected quickly.
Option B is incorrect because provisioning VPN is not a long-term solution since the traffic would increase to over 10Gbps.
Option C is CORRECT because (a) it provides a quick connection between the on-premise data center and AWS via VPN, and (b) it also initiates the provision of a Direct Connect solution to tackle the requirement of higher bandwidth (for 10Gbps network) for later.
Option D is incorrect because setting up Direct Connect will take time, and the application will not be up within time as it is time-critical. It needs to establish a VPN connection firstly.
For more information on VPN and Direct Connect, please visit the link below.
https://datapath.io/resources/blog/aws-direct-connect-vs-vpn-vs-direct-connect-gateway/