Q. Though the right border (RB) and left border (LB) of T-DNA are identical, the DNA transfer is specific for the DNA left of the RB (the T-DNA), rather than for the DNA left of the LB because

• (A) The sequence context at the RB defines the direction of transfer
• (B) The sequence context at the LB defines the direction of transfer
• (C) The nuclear location sequence (NLS) of VirD2 protein drives the excised T-strand
• (D) The endonuclease activity of VirD2 protein allows nicking at RB