Variable Names Each of the names below is either a valid or an invalid C++ identifier (as described by the naming rules). If an identifier would compile, it would be considered a valid name. For each name below, o if the identifier is invalid, write invalid and briefly explain the reason why it is invalid o if the identifier is valid, write valid. Invalid, sign not allowed as part of e.g. item identifiers culprit 2. to Day 3. days 6 th 5. do it 6. I WANT TO