You Are Starting Your New Job as the Sole HIM

You are starting your new job as the sole HIM professional at a small psychiatric practice. The practice uses DSM for billing purposes. You find this "theoretically" reasonable because DSM

A) is a widely used and accepted classification system.
B) codes are also valid ICD-9-CM codes.
C) codes are also valid CPT codes.
D) is the industry standard for psychiatric billing systems.