Which of the following sounds are considered harmonic?

Which of the following sounds are considered harmonic? Correct Answer Flute and trumpet

Musical instruments often produce a harmonic sequence of overtones. This is true for instruments that rely on the resonance of tensioned strings (guitar, violin, piano etc.) or air columns (trumpet, saxophone, flute etc.). Musical instrument such as trumpet, saxophone and flute is considered as harmonic sounds.
Bissoy MCQ

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The Proper sequence should be:
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