Final answer:
Design-Bid-Build is the option that is not a contract type in the given list.
Step-by-step explanation:
The correct answer is c. Design-Bid-Build.
In the construction industry, there are several types of contracts used. Unit Price, Lump Sum, and Cost-plus-fixed-fee are all commonly used contract types. However, Design-Bid-Build is not a contract type, but rather a project delivery method.
In Design-Bid-Build, the owner hires an architect or engineer to design the project, and then contractors bid based on those designs. Once a contractor is selected, they build the project according to the predetermined plans and specifications.