Write C++ relational expressions to express the following conditions. You just need to write the expression for the condition, not a program. A solved example for full credit is as follows: Body mass index is greater than 25.0 (Assume the identifier for body mass index is float bmi): bmi > 25.0 a. A person's age is above 18. (Assume the identifier for age is int age). b. A student's score is greater than 70 and less than 89. (Assume the identifier for score is int score). c. A letter is 'a', 'e', '1', 'o', or 'u'. (Assume the identifier for letter is char letter)