A higher population density, faster transmission rate, and longer infectious period each cause a disease like influenza to spread to more people. Which of the following statements correctly explain why?In Check all that apply: a. At high densities, infected individuals encountrr more individuals who are also infected. b. At high transmission rates, an infected-susceptible encounter is more likely to result in an infection c. With long recovery, an infected individual is contagious longer and can infect more susceptibles.