Which definition correctly describes ikhtiṣār al-ḥadīth?

Hadith Abbreviation, Narration by Meaning, and Unfamiliar Vocabulary

• Quoting a portion whose meaning is not governed by what was omitted
• Rewriting a report freely in one’s own words
• Deleting the final sentences of every long report
• Shortening only a sound hadith’s chain while retaining its text