Arrange the three given basic steps of genetically modifying an organism in correct sequence.

A. Introduction of the identified DNA into the host.

B. Maintenance of introduced DNA in the host and transfer of the DNA to its progeny.

C. Identification of DNA with desirable genes.

• A

  C - A - B

• B

  A - B - C

• C

  A - C - B

• D

  B - A - C