Vaccine design : most vaccine protect only against pathogens that within a certain region of atigenic space. suppose that a vaccine protects gainst any strain falling within a sphere of radious 2 centered at the point(2,1,0) in antigenic space. for each strain, determine whether this vaccine will be effective (a) astrain located at (0,0,0) in a antigenic space (b) astrain located at (1,0,3) in a antigenic space (c) astrain located at (1,0,1) in a antigenic space (d) astrain located at (1/4,2,1) in a antigenic space