निम्नलिखित में से कौन एक अध्ययन अभिकल्प (study design) नहीं है?

Aअनुप्रस्थ-परिच्छेदीय (Cross-Sectional)

Bसाक्षात्कार (Interview)

Cअनुप्रस्थ-सांस्कृतिक (Cross cultural)

Dअनुदैर्ध्य (Longitudinal)

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