You Are Building an AWS CloudFormation Template for a Multi-Tier

Multiple Choice

You are building an AWS CloudFormation template for a multi-tier web application. The user data of your Linux web server resource contains a complex script that can take a long time to run. Which techniques could you use to ensure that these servers are fully configured and running before attaching them to the load balancer? (Choose two.)

A) Launch your Linux servers from a nested stack that is called from within the load balancer resource in your AWS CloudFormation template.
B) Add an AWS CloudFormation Wait Condition that depends on the web server resource. When the UserData script finishes on the web servers, use curl to send a signal the Wait Condition at http://169.254.169.254/waithandle/.
C) Add an AWS CloudFormation wait Condition that depends on the web server resource. When the UserData script finishes on the web servers, use curl to signal to the Wait Condition pre-signed URL that they are ready.
D) In your AWS CloudFormation template, position the load balancer resource JSON block directly below your Linux server resource.
E) Add an AWS CloudFormation Wait Condition that depends on the web server resource. When the UserData script finishes on the web servers, use the command "cfn-signal" to signal that they are ready.