Every Texas gas station has $($or should have$)$ a sticker on every pump that ensures that that pump was tested to ensure the metered gallon actually dispenses a gallon of gas. Which state entity, in charge of weights and measures, places those stickers?

the Texas Department of Public Safety $($DPS$)$

the Texas Department of Agriculture $($TDA$)$

the Texas attorney general's office

the Railroad Commission $($RRC$)$