NK cells are derived from the same stem cells as b and t cells, these cells differentiate self from nonself through (b) MHCs.
The Major Histocompatibility Complex (MHC) is an essential component in the immune system's ability to distinguish among self and non-self antigens. MHC limits how an antigen is presented to the outside.
The remaining choices are incorrect due to the fact that they do not play a role in the mentioned discrimination but rather play different roles. The membrane attack complex, often known as MACs, is created in the complement pathway. Its purpose is to eliminate antigens; it does not distinguish across self and nonself antigens. Similar to this, TLRs (toll-like receptors) play a receptor role in the innate immune system and do not distinguish among self and nonself.
You can also learn about nonself antigens from the following question:
https://brainly.com/question/28540221
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