Which One of the Following Is NOT an Advantage of a Computerized

Which one of the following is NOT an advantage of a computerized master patient index?

A) It allows access to data alphabetically, phonetically, or by date of birth, social security number, medical record, or billing number.
B) It solves most space and retrieval problems.
C) It provides other departments with immediately access to the inform maintained in the master patient index.
D) Duplication of patient registration can never occur.