Dumb textbook question

So i get the sense that you're not supposed to buy books until you're told they're necessary. However the bookstore says you can get a full refund in the first week so i might just buy a few to be safe.

Anyways my question is this: for a particular class (MAR 3023) the required books are

MARKETING

MARKETING- CONNECT ACCESS

MARKETING LL W/ACCESS >BI<

These can't all be required, can they? Is the second one a textbook+connect access or just connect with ebook? Is it the best option if i had to buy just one? What does the third one even mean, and why is it twice as expensive?

please help me understand