Which of the following cells are part of the innate, second line of defense?

Differentiate between innate and adaptive immunity: Innate immunity is non-specific and responds to pathogens in a generic way, while adaptive immunity is specific and involves the activation of lymphocytes (B cells and T cells) that target specific antigens.

Recognize the function of other cells listed: Cytotoxic T cells and B cells are part of the adaptive immune system, not the innate system. Dendritic cells, while part of the innate system, primarily function as antigen-presenting cells to activate the adaptive immune response. Platelets are involved in blood clotting and not directly in immune defense.