Patient has admited with severe COVID19

patient has admited with severe COVID19, and saturation is 90%, what is oxygen device is used to administer oxygen?, is it nasal canula, or rebreathing mask?

Rebreathing mask is better …

This provides max ozygen …

But it depends on patient condition…

On going treatment

There is no hard and fast rule… to use only this at this saturation

Thank you sir

What are other options

Other two are simple face mask and venturi mask