1. (16pts)Mark the following identifiers as either valid or invalid. Valid Invalid a. theDog b. all-In-One c. const d. recycling e. DVD_ ROM f. elizabeth the_2nd g. 2morrow h. page# 2. (10pts) For the following output statement, the compiler reports this error message: UNDECLARED IDENTIFIER: cout cout const string TITLE = "Dr. "; cout return 0; using namespace std