A breathalyzer reports a blood alcohol content (BAC) of 0.05%. Which interpretation is most accurate?

The blood contains 0.05% alcohol by volume; the value lies on a continuous scale where higher values indicate greater physiological effects and risk.

It denotes the percentage of alcohol in the liver tissue specifically and cannot be compared to values obtained from blood or breath tests.

This value means the person has consumed 0.05 grams of alcohol in total in the last hour, which is below measurable risk and irrelevant clinically.

A BAC of 0.05% is equivalent to being completely sober and indicates no central nervous system effects whatsoever.