Indicate whether each of the following descriptions better applies to an adaptive (A) or innate (I) immune response. Your answer would be a four-letter string composed of letters A and I only, e.g. AAAA.
( ) It is found in invertebrate and vertebrate animals as well as in plants.
( ) It has a long-lasting memory.
( ) It is highly specific to the particular invading pathogen.
( ) It employs natural killer (NK) cells to induce apoptosis in infected host cells.