$A=\left[\begin{array}{cccc}4& 12& 5& 8\\ 1& 6& 2& 10\\ 9& 5& 6& 8\\ 4& 7& 3& 11\end{array}\right]$

Create the $44$ matrix A in Spyder. Then use the colon operator to create a $33$ matrix B out of

the top right corner of $A($indicated by the dashed lines$).$

Use the sum function to compute the sum of each column in $A.$

Use the max function from NumPy to find the highest number in $A.$