Multiple Choice

On the Island of Knights and Knaves live two types of people: Knights who always tell the truth and Knaves who always lie. As you are exploring the Island of Knights and Knaves, you encounter two people named A and B. A tells you "If I am a Knight, then B and I are both Knights. What are the natures of A and B? O A and B are both Knights. O A and B are both Knaves. O A is a Knight and B is a Knave. O A is a Knave and B is a Knight. Their respective natures cannot be determined. O None of these