Question: Complete the function below that returns the sum of all columns in a 2-D matrix as a column vector. For example, given matrix array([[ 0,

Complete the function below that returns the sum of all columns in a 2-D matrix as a column vector. For example, given matrix array([[ 0, 1, 2, 3, 4], [ 5, 6, 7, 8, 9], ... [90, 91, 92, 93, 94], [95

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