You have been told to make use of Cloudformation templates for deploying applications on EC2 Instances. These Instances need to be preconfigured with the NGINX web server to host the application. How could you accomplish this with Cloudformation?

Answer options:

A.Use the cfn-init helper script in Cloudformation.
B.Use the Output resource type in Cloudformation.
C.Use the Parameter resource type in Cloudformation.
D.Use SAML to deploy the template.

Answer - A
The AWS Documentation mentions the following.
When you launch stacks, you can install and configure software applications on Amazon EC2 instances by using the cfn-init helper script and the AWS::CloudFormation::Init resource. By using AWS::CloudFormation::Init, you can describe the configurations that you want rather than scripting procedural steps.
Because of what the AWS documentation clearly mentions, all other options are invalid.
For more information on the best practices for Cloudformation, please refer to the below URL-
https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/best-practices.html