Tom Jones Is Admitted to Sunny View Hospital on February

Tom Jones is admitted to Sunny View Hospital on February 3 and assigned patient number 123456. One year later, he is readmitted and assigned number 133890. The patient record from the folder labeled 123456 is renumbered as 133890 and filed in the newly created folder (also numbered 133890) . Folder 123456 remains in the filing system with a note indicating the new patient number. The system being used is called

A) numerical.
B) serial numbering.
C) serial-unit numbering.
D) unit numbering.