Select all the sentences that are logically equivalent to $x > 5 \Rightarrow x^{2} > k$.

A. $x^{2} > k \Rightarrow x > 5$

B. $x \leq 5 \:$ or $\: x^{2} > k$

C. $x > 5 \:$ and $\: x^{2} > k$

D. $x^{2} \leq k \Rightarrow x \leq 5$

E. $x \leq 6 \Rightarrow x^{2} \leq k$

F. None of the above