Which of the following is true about the clonal selection theory?

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The clonal selection model describes what happens when a B cell receptor (BCR)combines with an antigen.(1)The antigen is said to "select" the B cell that will clone.Also,at this time,cytokines secreted by helper T cells stimulate B cells to clone.(2)Defense by B cells is called antibody-mediated immunity because most members of a clone become plasma cells that produce specific antibodies.It is also called humoral immunity because these antibodies are present in blood and lymph.(3)Some progeny of activated B cells become memory B cells,which are the means by which long-term immunity is possible.Once the threat of an infection has passed,the development of new plasma cells ceases,and those present undergo apoptosis.

Which of the Following Is True About the Clonal Selection