5’ |GAAGTTCCTATGC||CGAAGTTCCTATTC||TCTAGAAA||GTATAGGAACTTC 3’ 3’ CTTCAAGGATACG||GCTTCAAGGATAAG||AGATCTTT||CATATCCTTGAAG 5’ If the DNA segments are named a, b, c and d respectively; and d is in opposite orientation to a and b, which of the following is dispensable for recombianse action?

• A. a
• B. b
• C. c
• D. d