Final answer:
None of the options provided (Belle, Ariel, Jasmine, Emerald, Informix) are commonly recognized as a pure OODBMS. Informix, while related to databases, is known as an object-relational DBMS, not an OODBMS. The listed options might point to an error or an uncommon proprietary system.
Step-by-step explanation:
A pure Object-Oriented Database Management System (OODBMS) product named in the textbook is likely to be ObjectStore, which is not mentioned in the options provided. However, looking at the given options, it seems there might be a confusion as none of these are known pure OODBMS products. Among these, Informix is associated with databases, but it is an object-relational database (not purely object-oriented), when referring to IBM Informix. If the textbook specifically mentions one of these names as a pure OODBMS product, it could be an error or referring to a less-known or proprietary system not widely recognized in the industry.