Which of the following can be used to debug the creation failure of CloudFormation stack resources with a disabled rollback? Choose 2 answers from the options below

Answer options:

A.Use CloudTrail to debug all the API calls sent by the CloudFormation stack.
B.Use the AWS CloudFormation console to view the events of your stack.
C.For Amazon EC2 issues, view the cloud-init and cfn logs published on the Amazon EC2 instance in the 
/var/log/
 directory.
D.Use AWS Config to debug all the API calls sent by the CloudFormation stack.

Answer – B, C
The AWS Documentation mentions
Use the AWS CloudFormation console to view the status of your stack. In the console, you can view a list of stack events while your stack is being created, updated, or deleted. From this list, find the failure event and then view the status reason for that event. 
For Amazon EC2 issues, you can check the cloud-init and cfn logs as these logs capture processes and command outputs when AWS CloudFormation is setting up the instances.
For more information on CloudFormation Troubleshooting, please visit the below URL:
http://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/troubleshooting.html