Final answer:
The peak of the free gingiva is known as the Gingival Margin, which is the boundary between the tooth crown and the gums.
Step-by-step explanation:
The term for the peak of the free gingiva is d) Gingival Margin. The gingival margin is the edge of the gingiva (gums) that comes in direct contact with the crowns of the teeth. It is an important anatomical landmark as it defines the boundary between the anatomical crown of a tooth, which is the portion visible above the gum line, and the gums surrounding it. It's important for oral health to maintain a tight and healthy gingival margin to prevent diseases such as gingivitis and periodontitis, which can lead to tissue damage and tooth loss.