What is the purpose of records with primary key values of -1, -2, and -3 contained in an Optim lookup table?

A.
They are seed records for every lookup table.

B.
They contain values that can only be accessed from anOptim exit/proc.

C.
They are placeholders that allow the client to quickly locate and create additional lookuptables values.

D.
They provide lookup values in cases where a lookup column contains nulls, orspaces , or zero length values.