Which of the following software development models BEST exemplifies a model that does NOT support...

The Waterfall model exemplifies a software development model that does not support the principle of early testing. In the Waterfall model, each phase must be completed before the next begins, which delays testing until after the completion of the earlier phases like requirements gathering and design. This can often result in finding defects later in the development cycle, making them more expensive and time-consuming to fix​(ISTQB not-for-profit association)​​(ISTQB not-for-profit association)​.References:

ISTQB® Certified Tester Foundation Level Syllabus v4.0:https://istqb-main-web-prod.s3.amazonaws.com/media/documents/ISTQB_CTFL_Syllabus-v4.0.pdf

ISTQB News Release on CTFL v4.0:https://www.istqb.org/news/posts/istqb-releases-certified-tester-foundation-level-v40-ctfl/