What Property of Restriction Enzymes Allows DNA from Different Organisms

What property of restriction enzymes allows DNA from different organisms to be combined?

A) They cut DNA randomly, so any DNAs might be combined.
B) They cut only small transformable fragments, not large chromosomal DNA.
C) Because they are naturally found in bacteria, they cut all transformed DNA.
D) If the same restriction enzyme cuts two different DNAs, the ends are complementary.