$11.$Consider the following relations on $\{1,2,3,4\}$: R$1=\{(1,1),(1,2),(2,1),(2,2),(3,4),(4,1),(4,4)\}$ R$2=\{(1,1),(1,2),(2,1)\}$ R$3=\{(1,1),(1,2),(1,4),(2,1),(2,2),(3,3),(4,1),(4,4)\}$ R$4=\{(2,1),(3,1),(3,2),(4,1),(4,2),(4,3)\}$ R$5=\{(1,1),(1,2),(1,3),(1,4),(2,2),(2,3),(2,4),(3,3),(3,4),(4,4)\}$ Which of the above relations is$/$are a$)$ Reflexive b$)$Symmetry c$)$Transitive