Please choose the correct answer to the question: Some immune cells are actively involved in ingesting, destroying, and presenting invading microbial antigens on their surface to stimulate other cells to produce antibodies. Which of these cells is responsible for initiating such an immune response?

Answer1: mast cells Answer2: phagocytes Answer3: B-lymphocytes Answer4: T-lymphocytes

Answer format: answer1/answer2/answer3/answer4
Answer: answer2