Problem 2. Define the following matrix in an m-file. 2 3 -9 1 5 -2 7 79 8-1 4 23 Write commands to: a) Select the second column of the matrix and store it in a variable. MATLAB code Matlab output b) Select the following elements from the matrix and store it in a variable. 5 -2 IMATLAB code 8 -1 c) Replace 11-3by to 1 in the original matrix. Matlab code Matlab output