Concatenating words

In Listing 1, we have several versions of a Python function that concatenates two words passed as arguments and returns the concatenated result.

Listing 1: Alternatives for the function concatenate (Question 1).
(a) 
def concatenate(word1, word2):
    result = word1 + word2
(b) 
def concatenate(word1, word2):
    return word1 + word2
(c) 
def concatenate(word1, word2):
    return
    return word1 + word2
(d) 
def concatenate(word1, word2):
    # return word1 + word2
    return

Choose the correct version of the function concatenate that concatenates two words passed as arguments and returns the concatenated result:

  1. Listing 1 (a)
  2. Listing 1 (b)
  3. Listing 1 (c)
  4. Listing 1 (d)

The + operator concatenates strings in Python. For example, if word1 is "data" and word2 is "base", the expression word1 + word2 produces "database".