Which of the following is an example of cross-contamination? a. a customer breaks their tooth after biting into a hamburger with a piece of glass mixed into it. b. a customer gets sick with e. coli after eating lettuce that was cut on same cutting board as raw meat. c. a customer gets sick with e. coli after eating lettuce that was cut on the same cutting board as fully cooked meat. d. a customer gets sick after eating a sandwich that was contaminated with pesticide solution.