A company runs a critical application in an Amazon VPC which will be accessed by application servers running in an on$-$premises data center via a Direct Connect connection. An SLA of $99\mathrm{.}9\%$ uptime is required for the Direct Connect connection. The company has an AWS Enterprise Support plan.

What is the MOST cost$-$effective way to meet this SLA requirement?

A$.$ Order an additional Direct Connect connection from AWS in a different cross$-$connect location terminated in the associated Region. Provision a new virtual interface $($VIF$)$ to the existing VPC and use BGP for load balancing.

B$.$ Create a second virtual interface $($VIF$)$ on the existing Direct Connect connection and terminate it in the existing VPC$.$ Use BGP for load balancing between the VIFs in active$/$active mode.

C$.$ Order an additional Direct Connect connection from AWS in the same cross$-$connect location. Provision a new virtual interface $($VIF$)$ to the existing VPC and use BGP for load balancing.

D$.$ Update the solution to include $4$ Dedicated Connections across a minimum of $2$ Direct Connect locations. Create a virtual interface for each connection and use BGP for load balancing between the VIFs in active$/$active mode.