A Difference Between the Innate Immune System and the Acquired

A difference between the innate immune system and the acquired immune system is

A) the innate immune system includes many more different types of receptors than the acquired immune system.
B) the innate immune response is immediate, whereas the acquired immune response is delayed, peaking about 3 to 5 days after exposure.
C) the innate immune system retains a memory for past exposure, with subsequent responses being faster and more aggressive; the acquired immune system does not.
D) each acquired immune system cell responds to a greater number of different pathogens than each innate immune system cell.