What are relaxed plasmids?

• A. The ones having copy numbers above 50 per cell
• B. The ones that can‚Äö√Ñ√∂‚àö√ë‚àö¬•t be digested by endonucleases
• C. The ones that can‚Äö√Ñ√∂‚àö√ë‚àö¬•t be isolated
• D. The ones present in more than one strains of the same host