As an experienced developer, I can tell you that D. req.error is the way to go here. Gotta love those 'request-response' questions, they're always a riot.
It's gotta be D. req.error. The question is practically begging for that answer. Although I do wonder if the exam writer has a sense of humor with those other options...
Definitely D. req.error is the way to go - it's the only option that specifically mentions 'error messages' and 'returning to the caller'. The others sound more like general request handling.
Felix
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