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8.251352 LAB - traversing nested lists by row or column Complete three functions that each take a 2D nested list of integers as a parameter sumfirstcolumn.0 returns the sum of all values in the first column of the 20 list sumlastrow0 returns the sum of all values in the last row of the 2D list calc_average() returns as a float the average of all elements in the list. Ex if the input list is: 1262393410455 then the returned value of sum_first_column() is 9, the returned value of sum_last_row() is 30 , and the returned value of calc_average() is 4.5 \begin{tabular}{l|l} LAB \\ ACriviry & 8.25.1:1352 LAB - traversing nested lists by row or column \end{tabular} main.py Load defauft templaten. Run your program as often as you'd like, before submitting for grading. Below, type any needed input values in the first box, then click Run program and observe the program's output in the second box