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 sum_2d_array(array):
  # Initialize sum
  _sum = 0
  # Iterate over array and add each element
  for row in array:
    for element in row:
      _sum += element
  # Return sum
  return _sum

arr = [[1, 2], [3, 4], [5, 6]]
print(sum_2d_array(arr))
user
21
assistant