The correct option is (4).

The cloning vectors possess the following features:

  1. A cloning vector should possess an origin of replication so that it can self-replicate inside the host cell.
  2. It should have a restriction site for the insertion of the target DNA.
  3. It should have a selectable marker with an antibiotic resistance gene that facilitates screening of the recombinant organism.
  4. It should be small in size so that it can easily integrate into the host cell.
  5. It should be capable of inserting a large segment of DNA.
  6. It should possess multiple cloning sites.
An ideal vector does not possess multiple recognition sites. In fact, it has a single recognition site. 

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