For the following genotypes indicate whether significant levels of active B-galactosidase enzyme can be detected in the absence or presence of lactose. (+) means significant levels of active B-galactosidase enzyme (-) means no significant levels of active B-galactosidase enzyme. lacl^+ lacP^+ lacO^+ lacZ^+ lacY^+ lacl^+ lacP^+ lacO^c lacZ^+ lacY^+ lacl^+ lacP^+ lacO^c lacZ^- lacY^+ lacl^S lacP^+ lacO^C lacZ^+ lacY^+ lacl^- lacP^+ lacO^+ lacZ^+ lacY^+/lacl^+ lacP^+ lacO^+ lacZ^+ lacY^+ lacl^S lacP^+ lacO^+ lacZ^+ lacY^+/lacl^+ lacP^+ lacO^+ lacZ^+ lacY^+ lacl^+ lacP^+ lacO^+ lacZ^- lacY^+/lacl^+ lacP^- lacO^+ lacZ^+ lacY^+ A. lactose absent +/lactose present – B. lactose absent +/lactose present + C. lactose absent -/lactose present – D. lactose absent -/lactose present +