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Relate the classification of English vowels and choose the correct alternative.
Vowels are produced with total closure of the oral cavity, causing a burst of air upon release.
Vowels in English are always classified based on their grammatical function in the sentence.
Vowels occur only when the vocal cords vibrate without any influence from tongue or lip position.
Vowels are classified according to tongue height, tongue position, and lip rounding during articulation.