सांख्यिकीय अनुसंधान में, एक निष्पक्ष संभाव्यता नमूना (unbiased probability sample) चुनने के लिए हमें यह सुनिश्चित करना होगा कि प्रत्येक इकाई का चयन ___________ और _________ हो।

Which of the following statements are correct regarding the methodological approaches ensuring rigor in social science research? I. Qualitative techniques are utilized to capture the depth and richness of human experiences. II. Quantitative techniques offer precision and objectivity, identifying patterns and testing hypotheses. III. Mixed methods combine both qualitative and quantitative approaches to offer a more holistic understanding of social phenomena. IV. Quantitative techniques are primarily aimed at capturing the depth and richness of human experiences. Choose the correct answer from the options given below:

Which of the following accurately captures the primary methodological limitation associated with the use of Schedules as a data collection tool, despite their ability to ensure uniformity and consistency?