Name whether this component of the immune system is involved in the first, second, or third line of defense. Each option can be used once, more than once, or not at all. Fever, Goblet Cells, Gut microbiome, Regulatory T Cells, Interferons, Antibodies, Dendritic Cells, Complement System.
a) First line of defense
b) Second line of defense
c) Third line of defense
d) Not involved in immune defense