What will be the output of following Python code?

d1 = {"a":10,"b":2,"c":3}
str1=""
for i in d1:
    str1 = str1 + str(d1[i]) + " " 
    str2 = str1[:-1]
print(str2[::-1])

1. 3, 2
2. 3, 2, 10
3. 3, 2, 01
4. Error

Running the code sorted(mydictionary, reverse = True) on a dictionary named mydictionary will return results sorted in what order?

1. Ascending order (A-Z), by key
2. Ascending order (A-Z), by value
3. Descending order (Z-A), by key
4. Descending order (Z-A), by value