An Engineer measured the Brightness values (in foot-lambert) of six display samples (3 samples of 1.0 mm thickness and 3 samples of 1.5 mm thickness) provided by each of three display suppliers. The measured values are provided below:

Display Supplier Glass Thickness (mm) A B C
1.0 280 300 290
1.0 290 310 285
1.0 285 295 290
1.5 230 260 220
1.5 235 240 225
1.5 240 235 230

Given that brightness specification is > 270, What combination of glass thickness and supplier should be selected to meet the specification with minimum variability?