Given that A[3][2] is a 2 dimensional array of integers, write a C++ function Sumto find the sum of all the array elements. It should have 3 input parameters A[3][2], lengthand width, where the second and third parameters represent the first and second dimension lengths of the array A. The function should return an integer as the sum. Inside the function, the two-layer forloop should use integers lengthand widthto control the loop.