How do our cells protect against attacks by complement?

Which statement reflects immunity in living things?

What is a role of natural killer cells? 

This antigen recognition receptor is found on the surface of T cells.

The PRR Dectin recognizes these microbes.

This organ/tissue makes most of the acute phase proteins.

You get sick with a cold and get over it. This is an example of this type of acquired immunity.

Natural killer cells release this cytokine to activate macrophages.

This complement protein is cleaved to become activated to cleave C4 in the classical pathway of complement activation.

A/n _____________________ is not a type of bond found in the interaction between antigens to antibodies.