Let A={ 1, 2, 3, 4} and R= {( 2, 2), (3, 3), (4, 4), (1, 2)} be a relation on A. Then R is

$\ne$ R as every element is not related to itself.
$\ne$ S as (1, 2) $\in$ R but (2, 1) $\notin$ R
T (1,2), $\in$ R, (2, 2) $\in$ R
$\Rightarrow$ (1, 2)o (2, 2) = (1, 2) $\in$ R