A newly discovered virus is being studied by scientists who have determined that the virus has a plasma membrane surrounding its capsid, its nucleic acid is used as a template to transcribe +mRNA, and it is transmitted from person to person via air droplets. Which of the following is true?
a. The virus is enveloped its nucleic acid is dsDNA, it is a retrovirus, and the mode of transmission is vertical
b. The virus is helical, its nucleic acid is +sRNA, and the mode of transmission is horizontal.
c. The virus is enveloped, its nucleic acid is - sRNA, and the mode of transmission is horizontal
d. The virus is helical, its nucleic acid is dsDNA, and the mode of transmission is vertical.