Which of the following statements accurately describes the distinction between primary and secondary immune responses?

The primary immune response is faster and more robust than the secondary immune response.

The primary immune response occurs upon re-exposure to the same antigen, while the secondary immune response is the initial response to a novel antigen.

Memory cells play a significant role in the secondary immune response, leading to a faster and more efficient reaction.

The primary immune response is solely mediated by memory B cells, while the secondary immune response involves the activation of memory T cells.