Use the medium setting when displaying a title only.

✓Correct

✕ Incorrect
Use the medium setting when displaying a title and summary only.

✓Correct

✕ Incorrect
Use the medium setting when displaying a title, summary and CTA buttons.

✓Correct

✕ Incorrect
You can use a combination of the title (mandatory), summary and CTA buttons — with either a medium or large setting.
Things to consider:

✓Correct

✕ Incorrect