Which of the following properties of plasmids are central to the evolution of bacteria?
i. Plasmids are genetically dispensable for host cells in the absence of a selection pressure.
ii. Some plasmids have the ability to get transferred horizontally from one cell to another.
iii. Some plasmids permit interaction between bacterial cells of different species.
iv. Plasmids are naked DNA molecules incapable of survival outside a living cell.
a. i & ii only
b. ii & iii only
c. i & iii only
d. i, ii & iv
