A．Killed-virus vaccines induce a broader range of immune responses than do attenuated live-virus vaccinesB．Killed-virus vaccines more closely mimic natural infections than do attenuated live-virus vaccinesC．Killed-virus vaccines pose no risk that vaccine virus might be transmitted to susceptible contactsD．Killed-virus vaccines are efficacious against respiratory virus infections because they induce good mucosal immunityE．All above are correct