You are building a game high score table in DynamoDB. You will store each user's highest score for each game, with many games, all of which have relatively similar usage levels and numbers of players. You need to be able to look up the highest score for any game.
What is the best DynamoDB key structure?

A. HighestScore as the hash / only key.
B. GameID as the hash key, HighestScore as the range key.
C. GameID as the hash / only key.
D. GameID as the range / only key.