Which one of the following schools is not a sub-division of the Mitakshara school?

"The Dayabhaga school" is a separate principal school of Hindu law (prevailing mainly in Bengal and Assam), not a regional sub-division of the Mitakshara school. As shown in the diagram, the Mithila school, the Dravida (or Madras) school, and the Benaras school are regional sub-schools of the Mitakshara school.