The correct option is A a, b, c, d and e
Recombinant DNA technology can be accomplished only if we have the key tools, i.e.,
a. Restriction enzymes
b. Polymerase enzymes
c. Ligases
d. Vectors
e. Host organisms
Restriction endonuclease enzyme and DNA ligases for recombinant DNA production. Vectors that help in carrying and integrating the desired gene. Host organism is that one in which recombinant DNA is introduced. Polymerase enzymes for polymerization.