$\text{Dry ice }\to {\mathrm{CO}}_{2( \mathrm{g})}$

Chemical reaction

             $\mathrm{Dry} \mathrm{ice} \to {\mathrm{CO}}_{2( \mathrm{g})}$

This process is known as the sublimation if dry ice.

 $\mathrm{\Delta H}$ is positive as it takes up energy when it sublimes. Dry ice is a more ordered arrangement as compared to carbon dioxide gas. So, the randomness of water particles increases. Thus, $\Delta \mathrm{S}$ is positive.

So, $\text{ Both }\mathrm{\Delta H}\text{ and }\mathrm{\Delta S}\text{ are positive }$ is the correct option.