Answer: !GetAtt

Overall explanation Correct option: AWS CloudFormation provides several built-in functions that help you manage your stacks. Intrinsic functions are used in templates to assign values to properties that are not available until runtime. !GetAtt - The Fn::GetAtt intrinsic function returns the value of an attribute from a resource in the template. This example snippet returns a string containing the DNS name of the load balancer with the logical name myELB - YML : !GetAtt myELB.DNSName JSON : "Fn::GetAtt" : [ "myELB" , "DNSName" ] Incorrect options: !Sub - The intrinsic function Fn::Sub substitutes variables in an input string with values that you specify. In your templates, you can use this function to construct commands or outputs that include values that aren't available until you create or update a stack. !Ref - The intrinsic function Ref returns the value of the specified parameter or resource. !FindInMap - The intrinsic function Fn::FindInMap returns the value corresponding to keys in a two-level map that is declared in the Mappings section. For example, you can use this in the Mappings section that contains a single map, RegionMap, that associates AMIs with AWS regions.

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