The Nurse Educator Knows That a Nursing Student Understands the Basics

The nurse educator knows that a nursing student understands the basics of immunity when the student nurse states:

A) herd immunity only pertains to cows.
B) active immunity can be attained via the use of vaccines.
C) passive immunity can be attained via the use of vaccines.
D) cross-immunity is immunity that causes a person who is immune to one disease to be also immune to a completely different infectious agent.