The given function is having four input variables  A , B , C and D

  The minterms are be combined using the adjacency property

  m13 + m9 : ABC'D + AB'C'D = AC'D

  m3 + m11 : A'B'CD + AB'CD = B'CD

  m0 + m2 : A'B'C'D' + A'B'CD' = A'B'D'