by time, name, etc.

Hi, Which one is correct? If first one iss correct, then the premise is that if you use a certain word as a category, then you don't have to use English articles, right? So, if one is intending (by context?) to use certain words as a category, then articles are not needed, right?

... presentations are listed by time, room number, topic and presenter's name.
... presentations are listed by times, rooom numbers, topics and presenters' names.