A hymn is a song of praise, which generally has four voice parts, Soprano, Alto, Tenor and Bass. So the answer would be number 3. Hope this helps!
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In addition to marking the qiblah, the mihrab traditionally helped to amplify the voice of the Imam during congregational prayer, although microphones now serve that purpose. The mihrab, also known as a prayer niche, is a common element of Islamic mosque architecture throughout the world. hope this helps