What safety standard did david m. theno implement at jack in the box restaurants after the e. coli outbreak in 1992? a. fast-food employees were required to submit to microbial testing several times during their shift. b. government inspectors had the authority to shut down the food production at any time. c. only meat slaughtered in the united states could be used to make hamburger patties. d. all refrigerated delivery trucks were required to have a record-keeping thermometer mounted inside.