In Python, Return the most frequent character in a string and the frequency of the character. Call the function string_mode. For example, if the input string is telephone, the function must return that the most frequent character is e and the frequency of e is 3. In case of strings where there are multiple characters with the same frequency (for example, mama), the program must return the most frequent characters and their frequency (in the mama example, the program must return that m and a are the most frequent characters, and that the frequency is 2). [Hint: you can return multiple outputs from a function. If the variable that stores the most frequent character is called max_char and the frequency associated with this character is called max_frequency, you can write return max_char, max_frequency].