e correct answer to the following questions) प्रयोगात्मक कार्यमा निम्न मध्ये कुन समावेश हुन्छ? (Which of the following involves in C. practical work?) अवलोकन (Observation) परिकल्पना (Hypothesis) b. परीक्षण (Test) d. माथिका सबै (All of them) tha-​