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 an Optim exit/proc.
C . They are placeholders that allow the client to quickly locate and create additional lookup tables values.
D . They provide lookup values in cases where a lookup column contains nulls, or spaces, or zero length values.
Answer: D