A mass of about 250 g is to be measured in a room where temperature fluctuations introduce a systematic error of ±0.30 g. The total percentage uncertainty (instrument + systematic) must not exceed 0.30 %. Which balance should be selected?
a) Balance Q: least count 0.60g
b) Balance R: least count 0.40g
c) Balance S: least count 0.70g
d) Balance P: least count 1.0g