Define relations $R_1,\ldots,R_6$ on $\lbrace 1,2,3,4 \rbrace$ by

$R_1=\lbrace (2,2),(2,3),(2,4),(3,2),(3,3),(3,4) \rbrace,$
$R_2 = \lbrace (1,1),(1,2),(2,1),(2,2),(3,3),(4,4)\rbrace,$
$R_3 = \lbrace (2,4),(4,2) \rbrace$ ,
$R_4 = \lbrace (1,2),(2,3),(3,4)\rbrace$,
$R_5 = \lbrace (1,1),(2,2),(3,3),(4,4)\rbrace,$
$R_6=\lbrace (1,3),(1,4),(2,3),(2,4),(3,1),(3,4) \rbrace,$

Which of the following statements are correct?
Check ALL correct answers below.

A. $R_3$ is symmetric
B. $R_4$ is symmetric
C. $R_5$ is not reflexive
D. $R_2$ is reflexive
E. $R_3$ is transitive
F. $R_1$ is not symmetric
G. $R_4$ is antisymmetric
H. $R_3$ is reflexive
I. $R_4$ is transitive
J. $R_2$ is not transitive
K. $R_6$ is symmetric
L. $R_1$ is reflexive
M. $R_5$ is transitive