A student measures the dimensions of a rectangular copper sheet used in an electromagnetic shielding experiment. The length is measured as 72±3 mm72 \pm 3\text{ mm}72±3 mm and the width is measured as 34±2 mm34 \pm 2\text{ mm}34±2 mm.
Which is the best estimate of the area of this copper sheet, taking into account standard scientific rules for rounding uncertainties?
2400±5 mm22400 \pm 5\text{ mm}^22400±5 mm2
2400±6 mm22400 \pm 6\text{ mm}^22400±6 mm2
2448±246 mm22448 \pm 246\text{ mm}^22448±246 mm2
2400±200 mm22400 \pm 200\text{ mm}^22400±200 mm2
