pivot() या melt() जैसे फ़ंक्शंस का उपयोग करके DataFrame की संरचना या लेआउट को बदलने की प्रक्रिया को ____________ के रूप में जाना जाता है।

Consider the given Pandas DataFrame 'df4': Index | NAME | PERIODIC | ENG | MATHS | SCIENCE 12 | MEENA | 1 | 40 | 60 | 80 17 | REENA | 2 | 60 | 30 | 10 18 | TEENA | 3 | 80 | 60 | 40 20 | SHEENA | 2 | 90 | 20 | 70 Select the correct command to get the following output: NAME: MEENAREENATEENASHEENA PERIODIC: 8 ENG: 270 MATHS: 170 SCIENCE: 200

In Python's Pandas library, the DataFrame.quantile() function is used to obtain values at given quantiles. The second quartile (0.50 quantile) is commonly known as the ____________.