A team has currently set up a DevOps project. The lead wants to use the Analytics service to see the count of work items over time for each column of a Kanban board. Which of the following widget would serve this purpose?

Answer options:

A.Burnup
B.Cycle Time
C.Lead Time
D.Cumulative Flow Diagram

Answer – D 
You can use the Cumulative Flow Diagram for this purpose. The Microsoft documentation mentions the following. 

Option A is incorrect since this is normally used to display a trend of completed work across multiple teams and multiple sprints. 
Option B is incorrect since this is used to analyze the time it takes for your team to complete work items once they begin actively working on them. 
Option C is incorrect since this is used to analyze the time it takes to deliver work from your backlog. 
For more information on analytic widgets, please visit the below URL- 

https://docs.microsoft.com/en-us/azure/devops/report/dashboards/analytics-widgets?view=azure-devops