Correct answer is Request access to the API in Anypoint Exchange. This way we can get clientId and Client secret which we can use to access the API

The HTTP 415 Unsupported Media Type client error response code indicates that the server refuses to accept the request because the payload format is in an unsupported format. The format problem might be due to the request's indicated Content-Type or Content-Encoding , or as a result of inspecting the data directly. As per RAML input is expected in application/xml.
Hence correct answer is Set a request header with the name Content-Type to a

Correct answer is as below.
After all processing routes have finished execution, the Scatter-Gather component creates a new Mule event that combines all resulting Mule events from each route, and then passes the new Mule event to the next component in the flow.
{
"0": {
"attributes": ...,
"payload": "100"
},
"1": {
"attributes": ...,
"payload": "200"
}
}
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Sequence can be described as follows.
* When web client sends the request , it sends payload as Blue (mentioned in question)
* In first iteration this will go to default choice , which sets payload to Red
* Via default route , flow will call itself with payload as Red
* In second iteration , as payload is Red , it will go to first route in choice router which will set payload to Blk and second iteration will end returning back payload as Blk to first iteration.
* This Blk will be again set to payload and first iteration will end returning back response as Blk

Correct answer is Save the payload from the Database SELECT operation to a variable Response from HTTP request will override the payload and hence response of database SELECT can be lost. Best way to preserve is to assign payload of first operation to variable using TransformMessage.