What are 3 ways to gain passive immunity?

Three ways to gain passive immunity include receiving antibodies through maternal transfer during pregnancy or breastfeeding, receiving antibody-rich serum through medical treatments such as intravenous immunoglobulin (IVIG), and acquiring specific antibodies via vaccination with live attenuated pathogens that stimulate an immediate immune response without the body having to produce its own antibodies. Unlike active immunity, passive immunity provides immediate protection but is temporary.