Final answer:
In a weighted scoring model, the sum of the weights of all the criteria must total 100 percent.
Step-by-step explanation:
In a weighted scoring model, the sum of the weights of all the criteria must total 100 percent (option c). This means that all the weights assigned to the criteria should add up to 100 percent. The weights represent the relative importance or priority given to each criterion in the scoring model. For example, if there are three criteria with weights of 30 percent, 40 percent, and 30 percent, the total sum of the weights would be 100 percent.