Which statement(s)-based on passive immunity are correct: I. Passive immunity involves the transfer of pre-formed antibodies from one individual to another. II. Passive immunity can be acquired naturally or artificially. III. Maternal antibodies transferred across the placenta to the fetus provide passive immunity to the newborn. IV. Passive immunity provides immediate protection against pathogens but is temporary, lasting only as long as the transferred antibodies remain active. Select one: O a. Statements I and II O b. Statements II and III O c. Statements III and IV O d. All statements Clear my choice