Given the matrix A = [1 8 2 7 0 3; 1 2 9 8 4 7], use a 'for' loop to:
A. Add up the values of the elements (Hint: use the "sum" command).
B. Compute the running sum (for element j, the running sum is the sum of the elements from 1 to j, inclusive. [Hint: use the "cumsum" command]
C. Replace all the elements <= 5 with zeros (Hint: use 'if' inside the 'for' loop).