Match List-I with List-II and select the correct answer:

List-I	List-II
a. The Cairns model	1. The newly formed DNA strands become covalently joined to the ends of the parental chromosomes
b. The Yoshikawa model	2. Replication begins by denaturation of the DNA double strands at a specific site called origin
c. The rolling circle model	3. The chromosome first becomes double stranded by the synthesis of a negative strand