The ANSI ASC X12N 837 is a
a. variable-length file format that is used to submit institutional, professional, dental, and drug claims.
b. series of fixed-length records that is used to bill institutional services, such as services performed in hospitals.
c. flat file format that is used to bill physician and noninstitutional services, such as services reported by a general practitioner on a CMS-1500 claim.
d. unique 11-digit, three-segment number, which identifies a vendor, product, and trade package size