Which cells are held in reserve to be used for a rapid response to subsequent intruders of the same type?

A) NK cells
B) helper T cells
C) cytotoxic T cells
D) memory cells
E) B cells

Memory Cells

A type of immune cell that retains a memory of past pathogens to enable a quicker response upon re-exposure.

Rapid Response

A swift reaction to an event or series of events that requires immediate attention and action, often used in emergency or critical situations.