Problem: You're examining rates of deaths involving pneumonia over the past 5 years in BC by looking at the underlying cause of death recorded in the BC Vital Statistics data. Note that the BC Vital Statistics has consistently used ICD codes to record underlying causes of death during this period. Which of the following would be the biggest concern regarding the validity of your study? Need Assignment Help? Group of answer choices Representativeness of BC Vital Statistics mortality data to all registered BC residents Different coding rules related to causes of deaths across different regions in BC The common use of verbal autopsy Sensitivity of your outcome measure (i.e., deaths involving pneumonia) All of the above