Change the Status field (Data Type Field) automatically after assigned User takes action

Case: I have Process model which has two task assignment nodes. 

I have a database field called Status--(Dropdown Options: Analysis, Approver, Complete)

When the task is added by the admin then Status field should be defaulted to "Analysis" --> Now the task goes to Analyst (when Analyst Submits the task the field should changes to "Approver"--> Lastly, the task goes to Approver (when approver completes the task then the Status field should change to "Complete"

How can I achieve this?

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