Analyze the relationship between 'AutoCAD' and 'Autodesk' within the context of the input sentence.
Options: owner of, distribution format, developer, legal form

Calibre Diona has been partnering with Autodesk for 20 years, and our products have enabled them to continue innovating to deliver valuable design and engineering solutions to their customers as both CAD technology and engineering practices have evolved from the drawing board to AutoCAD and now to BIM.
developer