An Alexa Skill Builder Is Developing a Skill Using AWS

An Alexa Skill Builder is developing a skill using AWS Lambda. The Builder made some backend code changes, then tested the skill on an Amazon Echo device. When invoking the skill, Amazon Alexa replies with "There was a problem with the requested skill's response". How can the Builder troubleshoot this problem?

A) Use Amazon CloudWatch to check the most recent execution log and see if an error is present.
B) Use Amazon DynamoDB and export a copy of the log database, then search for error messages.
C) Use the developer console to rebuild the model, then invoke the skill again with the invocation name.
D) Use the developer console to add AMAZON.LaunchRequest to the interaction model, rebuild the model, then invoke the skill again. Use the developer console to add AMAZON.LaunchRequest to the interaction model, rebuild the model, then invoke the skill again.