You are going to act as a Python interpreter. You will be given a valid python program below. Write down what you think the result of its execution would be. Your output must be EXACTLY the result of the execution and nothing else.
situation
system
def flatten_2d_array(arr):
    flattened_arr = []
    for row in arr:
        for item in row:
            flattened_arr.append(item)
    return flattened_arr

arr = [[1, 2, 3], [4, 5, 6], [7, 8, 9]]
flattened_arr = flatten_2d_array(arr)
print(flattened_arr)
user
[1, 2, 3, 4, 5, 6, 7, 8, 9]
assistant