[" 11.Let R be the relation in the set "N" given by "R={(a,b):a=b-2,b>6}" .Choose the correct "],[" answer "],[[" (A) "(2,4)varepsilon R," (B) "(3,8)varepsilon R," (C) "(6,8),varepsilon Rquad (D)(8,7)varepsilon R],[" (A) "3x" (B) "27x," (C) "64xquad " (D) none of these "]]