Answer-first summary for fast verification
Answer: Omission of ImportValue for subnet references., Subnets not exported in Outputs by the network team's template.
The developer's template fails to launch because it does not use the ImportValue intrinsic function to refer to the subnets created by another template. This function is necessary to import values from another stack's Outputs section. Additionally, if the network team's template does not export the subnets in the Outputs section, the developer's template will not be able to import these values. Therefore, the correct answers are B and D.
Author: LeetQuiz Editorial Team
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Why did the developer's AWS CloudFormation stack launch fail when referencing subnets from another template?
A
Lack of Ref function to reference subnets.
B
Omission of ImportValue for subnet references.
C
Incorrect subnet references in the Mappings section.
D
Subnets not exported in Outputs by the network team's template.
E
Subnets not exported in Mappings by the network team's template.