Suppоse yоu inоculаte three 20 mL tubes of minimаl sаlts broth with 5 drops E. coli from a TSB culture. Tube A contains glucose. Tube B contains glucose and lactose. Tube C contains lactose. After 6 hours of incubation, you test the experimental broths for the presence of beta-galactosidase. (An enzyme important in lactose catabolism.)Which broth(s) will have this enzyme?