Pate sued Dr. Doke for psychiatric malpractice and called Dr. Will as an expert witness. During Will's direct testimony, Will identified a text as a reliable authority in the field. He seeks to read to the jury passages from this book on which he had relied in forming his opinion on the proper standard of care. The passage is 
admissible, as a basis for his opinion and as substantive evidence of the proper standard of care.  admissible, as a basis for his opinion but not as substantive evidence of the proper standard of care.  inadmissible, because a witness's credibility cannot be supported unless attacked.  inadmissible, because the passage should be received as an exhibit and not read to the jury by the witness.