What does "two identifiers" refer to in patient check-in?

What does "two identifiers" refer to in patient check-in?

• A. Two unique patient identifiers (commonly full name and date of birth) used to verify identity.
• B. A doctor’s name and patient’s middle name.
• C. A patient’s address and phone number only.
• D. The patient’s favorite color and hometown.

Answer: (B)