Ankita can understand and speak six different languages. Her language ability makes her a

The correct answer is multilingual speaker.

Let us break down the terms to understand why this is the correct classification for Ankita's language ability:
1. Monolingual speaker: A person who can understand and speak only one language (from the prefix mono-, meaning "one").
2. Bilingual speaker: A person who can understand and speak two languages fluencing (from the prefix bi-, meaning "two").
3. Multilingual speaker: A person who can understand and speak multiple languages, typically three or more (from the prefix multi-, meaning "many"). Since Ankita can understand and speak six different languages, she fits this definition perfectly.
4. Linguist: A person who studies language and its structure scientifically. While a linguist may speak multiple languages, the term refers to the scientific study of language rather than just the ability to speak many languages.

Therefore, Ankita's ability to speak six different languages makes her a multilingual speaker.