(Markov matrix) An n × n matrix is called a positive Markov matrix, if each element is positive and the sum of the elements in each column is 1. Write the following function to check whether a matrix is a Markov matrix:
const int SIZE = 3 ;bool isMarkovMatrix(const double m[][SIZE]);
Write a test program that prompts the user to enter a 3 × 3 matrix of double values and tests whether it is a Markov matrix. Here are sample runs:

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