Final answer:
The correct answer is a. unit numbering system. This system assigns a unique patient number at the first registration, maintained for all subsequent care.
Thus the corret opction is:c
Step-by-step explanation:
In the medical record keeping system, a unit numbering system is used when a patient is assigned a unique patient number the first time he or she is registered, and then the patient retains that same number for all subsequent admissions and health care encounters.
The main advantage of such a system is that it allows for the consolidation of all of a patient's information under a single number, making it easier to track an individual's medical history.
This contrasts with systems where new numbers may be assigned for each visit, potentially fragmenting the patient's records across multiple files.