3 points The following method is intended to return a string containing the character at position n in the string str. For example, getChar("ABCDE", 2) should return "C"* /" missing precondition / public String getChar (String str, int n) { return str.substring(n, n + 1); 3 O /* Precondition: 0 str.length() */ O /* Precondition: 0 = str.length() */<>