Question 15 1 pts Given the following Python code (Listing 4): 1 2 3 4 5 6 7 8 9 10 11 def q23 (astr): '' (str)-> (list of str)''' countd [] for item in astr: if item in countd: countd[item) += 1 else: countd[item] = 1 countli = countd.values() ct = max (countli) 12 13 14 15 16 17 18 mli [] for item in countd: if countd[item] == ct: mli.append(item) return mli teststr = aabbbc. When 923(teststr) is executed, the value of mli at line 18 is O fa','b, 'e'] O ['b'] none of these options O 'a': 2.b: 3, 'e: 1) O ['b: 3) O 12,3,1]