Q$3$: Let arr be a $2-$dimensional NumPy array. Assuming that all the elements in arr are integers. Write a function

that multiplies all the even integers by $3$ and all the odd integers by $4.$

For example, if arr is $\left[\begin{array}{ccc}1& 2& 3\\ 4& 5& 6\end{array}\right],$ you should return $\left[\begin{array}{ccc}4& 6& 12\\ 12& 20& 18\end{array}\right].$ Please write this code in python