Innate immune system is the body’s 1st line of defense. Innate immunity is a nonspecific resistance that we have from the time of birth. For example, any inflammatory response is attained by the innate immune system to invade a pathogen is referred as activity of nonspecific immune system.
The specific antigens do not trigger innate immunity; so, it is a non-specific defense system regardless of the type of invading agent.
Thus, the options (a), (b) and (d) are incorrect.
Any inflammatory response is attained by the innate immune system to invade a pathogen is referred as activity of nonspecific immune system.
Therefore, the correct option is – c). the nonspecific immune system is at work.