A New Graduate Asks the Nurse Manager,"What's the Meaning of This

A new graduate asks the nurse manager,"What's the meaning of this alphabet soup that's added after this nurse's name: Jane Bigham,RN,CRNA?" The best explanation for the nurse manager to give would be: "It means the nurse is licensed to practice in this state and

A) has met predetermined standards for certification set by a credentialing group for nurse anesthetists."
B) is also a certified rehabilitation nursing assistant."
C) has been licensed by the central registry for nursing assessment specialists."
D) is joking about the nurse's age.The initials stand for Certified Real Nurse Antique."