Choose the incorrect statement for cre-lox excision.

• A. The chromosomal copy of the target gene replaces the target gene flanked by loxP sites
• B. The second step is supply of Cre recombinase
• C. Integration of cre takes place under a controllable promoter followed by induction of the promoter
• D. Induction results in expression of cre, recombination along loxP sites and excision of the sequence between