Final answer:
The term 'Nurse Anesthetist' alone is not a formal nursing credential; the correct formal title is Certified Registered Nurse Anesthetist (CRNA). Therefore, 'D) Nurse Anesthetist' is the correct answer to the question of which is not a nursing credential.
Step-by-step explanation:
Among the options provided, A) RN, B) NP, and C) LPN/LVN are indeed nursing credentials. RN stands for Registered Nurse, NP for Nurse Practitioner, and LPN/LVN for Licensed Practical Nurse/Licensed Vocational Nurse. However, D) Nurse Anesthetist is not a nursing credential in itself; the correct term for this specialized role is Certified Registered Nurse Anesthetist (CRNA), which suggests that the simple term 'Nurse Anesthetist' might not represent a formal credential.
Therefore, the correct answer to which of the following is not a nursing credential is 'D) Nurse Anesthetist' - assuming it is intended to mean a credential separate from CRNA.