Question 3 (1 point) While string comparisons can be done using the usual operators (such as,), the programmer must be careful when making such comparisons because all uppercase letters come before all the lowercase letters. O True False Save Question 4 (1 point) The function len() returns the number of characters of a string, and must be invoked using the ".", or dot-operator, as in the following: greeting-"Hello" print greeting.len O True O False