An E. coli strain that is lac Z is conjugated with E. coli cells carrying an F' plasmid with the p_lac O^c lac Z DNA sequence on the episome. The O^c is a mutation of the lactose operator that is no longer able to bind the lac I gene product which codes for the lac repressor. How would the expression of the lac Z be regulated in the resulting cells that are diploid for the lactose regulatory region and the lac Z gene?

A.	normal regulation of lactose metabolism.
B.	constitutive expression of lac Z+.
C.	inability to synthesize the lac Z+ gene product, ß-galactosidase.
D.	lac Z+ gene is inducible, but unable to be repressed by high glucose.
E.	no synthesis of the lac I gene product, the lac repressor.