Which of the following is NOT a trademark held by ASET?

The choice identified is correct because "Certified Data Engineer (C.D.E)" is not a trademark held by ASET. ASET focuses on a specific set of designations for individuals in the fields of engineering technology and applied science. The trademarks associated with ASET include "Certified Engineering Technologists (C.E.T)", "Certified Technician (C. Tech)", and "Applied Science Technologist (A.Sc.T)", which are widely recognized within the profession.

The absence of "Certified Data Engineer (C.D.E)" from this list indicates that it is not part of ASET's official designations, thus confirming the accuracy of the selected response. The other options represent legitimate certifications recognized by ASET for professionals in engineering and technology.