What’s the most efficient way to target one headline to 10 different audience IDs in a feed?

–What’s the most efficient way to target one headline to 10 different audience IDs in a feed?–

–Add 10 columns with a different audience ID in each column–

–Add 10 rows and 10 columns with an audience ID in each row and column–

–Add 10 rows with a different audience ID in each row–

–Add 10 comma-separated audience IDs into one cell–