Which of the following statements about B-lymphocytes and T-lymphocytes is correct?
- AThey become active only when a specific antibody binds to their surface receptor.
- BThey divide to form clones when meeting an antitoxin in a cell.
- CThey produce memory cells to respond to an antigen when exposed in the future.
- DThey release hormone-like cytokines which stimulate release of antibodies.