For installing box-rib lagging on top surfaces, which of the listed methods is correct?
a. Lower sheets are installed on top of higher sheets.
b. Screws are installed through the high surfaces of the ribs.
c. Lagging is installed with the ribs running horizontally across the slope.
d. Lagging is installed so the ribs run parallel to the longest dimension of the surface.
b. Screws are installed through the high surfaces of the ribs.
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