Which of the following is not a type of informal report? a complaint b progress c troubleshooting d feasibility

D feasibility is your best answer

Feasibility means "easily or conveniently done", which is not a extremely formal way of finishing things.

Complaints generally are formal, for you are trying to do business.

Progress brings formatility, for it must be formal and formatted for success.

Troubleshooting also needs formality, so that one can solve the problem as soon as possible

hope this helps

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