According to the classification based on tongue muscle tension, vowels are divided into which categories?

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Rounded vowels and unrounded vowelsVowels articulated at the front and back of the mouthVowels produced with a high or low tongue positionTense vowels and lax vowelsNasal vowels and oral vowels

Explanation

Vowels can be categorized by various features. When classified by the tension of the tongue muscles during articulation, they are grouped into tense vowels, which involve greater muscular effort, and lax vowels, which require less tension.