Explain what the following resource in a CloudFormation template does?

Answer options:

A.Creates an SNS topic that allows SQS subscription endpoints to be added as a parameter on the template.
B.Creates an SNS topic that allows SQS subscription endpoints.
C.Creates an SNS topic and then invokes the call to create an SQS queue with a logical resource name of SQSQueue.
D.Creates an SNS topic and adds a subscription ARN endpoint for the SQS resource created under the logical name SQSQueue.

Answer – D
The intrinsic function Fn::GetAtt returns the value of an attribute from a resource in the template. This has nothing to do with adding parameters (Option A is wrong) or allowing endpoints (Option B is wrong) or invoking relevant calls (Option C is wrong).
For more information on Fn:: GetAtt function, please refer to the below link
http://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/intrinsic-function-reference-getatt.html