An Auditor Examined the Database for Trent's Textiles Corporation

Multiple Choice

An auditor examined the database for Trent's Textiles Corporation. During her examination, she noticed two cash disbursements in the Cash Disbursements table had blanks (null values) in the vendor number field. Assuming no data entry error has occurred, what is the most plausible explanation for these blanks?

A) There is no plausible explanation - an error must have occurred.
B) Referential integrity was not established between Vendor and Cash Disbursement
C) The participation of Cash Disbursement in the relationship with Vendor is optional
D) The participation of Vendor in the relationship with Cash Disbursement is mandatory
E) The participation of Cash Disbursement in the relationship with Vendor is mandatory