Exam Preparation Exercises . Mark the following identifiers as either valid or invalid. Invalid a. theDog b. all-In-One c. const d. recycling e. DVD ROM f. elizabeth-the-2nd- 2morrow h, page# 2. Given these assignments to string variables: string1: "Bjarne Stroustrup: string2 "C string3 "programming language' string4" because it is a successor to the"; string5 named his new What is the value of the following expression? string1 string5 string3string2 string4 string2. stromg3+- . Reorder the following lines to make a working program. #include-iostream const string TITLE Dr. cout "Hello TITLE Stroustrup! int main() #include return 0 using namespace std