1. How many of the following statements about Human Metapneumovirus (HMPV) and Norovirus are correct? 1. HMPV is a respiratory virus that causes severe infections similar to pneumonia in healthy individuals. 2. Norovirus is highly contagious and primarily spreads through the fecal-oral route. 3. HMPV belongs to the Pneumoviridae family, which also includes the respiratory syncytial virus (RSV). 4. Currently, there are no specific antiviral treatments or vaccines available for either HMPV or Norovirus. (a) Only one (b) Only two (c) Only three (d) All four