Which of the following is a restriction for cloning in bacteriophage Mu?

• A. It is limited to handling only small number of phage particles
• B. It relies on whether the DNA is flanked by two mini Mu genes or not
• C. Recombination between the elements in the second strain is not a restriction
• D. Fragments of any genomic DNA can be cloned irrespective of the fact whether or not the phage can replicate in it or not