The MINIMUM Dimensions of the Telecommunications Main Grounding Busbar Is

The MINIMUM dimensions of the telecommunications main grounding busbar is ________ and variable in length.

A) 4 mm (0.16 in) x 80 mm (3.15 in)
B) 6.3 mm (0.25 in) x 100 mm (4 in)
C) 8 mm (0.31 in) x 110 mm (4.33 in)
D) 10.5 mm (0.41 in) x 140 mm (5.51 in)
E) 12.75 mm (0.50 in) x 175 mm (6.89 in)