Given variable M that is a matrix of size 8x8, assign to variable sub the contents of the first 3 rows & last 4 columns in M Example: Input M- [10 -5 71-1 29 10 8-3 1-9 -3 3 76 7-6 9 1-7417 5 -5-4 6 6 5 10 8 7 259-4-1-9-9 5-1 5 -81-9-1-2 output sub- [-12 9 10 10 -5 -7-10 3 37 6]