The following two results hold for the notion of normal-form trembling-hand perfect (THP) equilibrium.
Corollary: in a THP equilibrium, no weakly dominated pure strategy can be played with positive probability.
Lemma. In any two-player game, any Nash equilibrium without weakly dominated strategies is THP.
The corollary rules out the Nash equilibrium $(R,F)$. The lemma confirms that the other two Nash equilibria $(T,D)$ and $(B,E)$ are also THP.