What’s the MINIMUM depth of a trench from top of the cable/conduit to final grade? (Select two options.)

What’s the MINIMUM depth of a trench from top of the cable/conduit to final grade? (Select two options.)
A . 305 mm(12 in)
B . 610 mm (24 in)
C . 914 mm (36 in)
D . 1270 mm (50 in)
E . Below the area’s 50-year frost line

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Answer: B, E