Greatest Integer Function Inequality

$\left(3,\sqrt{10}\right)\cup \left[5,\sqrt{26}\right)\cup \left\{6\right\}$

$\left[3,\sqrt{10}\right] \cup \left[5,\sqrt{26}\right]$

$\left[3,\sqrt{10}\right]\cup \left[4,\sqrt{17}\right]\cup \left\{6\right\}$

$\left(4,\sqrt{18}\right)\cup\left[5,\sqrt{27}\right)\cup\left\{6\right\}$