Yup. The fire department, at least, would like to know what gas is in a bottle like this if they have to enter the premises during an emergency.
Nothing is right with this photo though! Here is a pressurized gas cylinder that is supported by a single twist of wire placed below its centre of gravity. That is dangerous. That is nuts.
And this sort of rule regurgitation is precisely why reductionst teaching and dutiful student mentalities/banalities are the death of inventive science. "Hell, there are no rules here - we're trying to accomplish something." - Thomas A. Edison