Scrumban has evolved into a separate approach that uses Scrum as a framework and Kanban for process improvement. Which of the following in NOT true in Scrumban?

a$.$

Work is organized into small "sprints," and uses Kanban boards to monitor work

b$.$

Work is limited using work$-$in$-$progress limits

c$.$

Stories are placed on the Kanban board

d$.$

There are pre$-$defined team roles