What is the feature of plasmid used as cloning vector?

Q. The most important feature in a plasmid to serve as a vector in gene cloning experiment is:

Q. The most useful plasmid for cloning is

Q. Plasmids are the suitable vectors for genetic cloning as

Q. The most important feature in a plasmid to be used as a vector is:

Q. During gene cloning, the enzyme used to join the insert DNA with the plasmid vector is