What is a key difference between reservation buying and auction buying?

Q. What is a key difference between reservation buying and auction buying?

A. Reservation buying is done manually, while the auction buying is done through a Google representative

B. Reservation buying means pre-packaged lineups, while auction buying is for individual impressions.

C. Reservation buying includes hard-to-sell inventory, while auction buying does not.

D. Reservation buying is done programmatically, while auction buying is done manually

Correct Answer is:

B. Reservation buying means pre-packaged lineups, while auction buying is for individual impressions.