Python Programming

Consider this recursive function that computes the sum of all digits of an integer (in base 10):

def digits_sum(n):

if n < 10:

return n

... part A ... # missing. You find out what's on this line.

The recursive case is missing. Which of the following options is the correct line that substitutes part A ?

1. return (n % 10) + digits_sum(n / 10)

2. return digits_sum(n % 10) + (n % 10)

3. return (n % 10) + n // 10

4. return (n // 10) + digits_sum(n % 10)

5. return (n % 10) + digits_sum(n // 10)