Consider a recursive function sumDigitsR(num) that returns the sum of the digits of the input parameter, which is an integer called num. It can be assumed that 'num' is a non-negative

For example: sumDigitsR(1983) = 21.

Which of the following is a valid base case for the recursive function sumDigitsR?

Question options:

	Both num < 10 and num <= 0
	len(num) == 0
	None of the answers are correct
	num < 10
	num <= 0