__________ type of scaffolding is used when the proper hard ground is not available for the standards to rest.
(a) Steel scaffolding
(b) Trestle scaffolding
(c) Bricklayers scaffolding
(d) Cantilever scaffolding
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Question is from Component Parts of a Scaffolding topic in division Scaffolding, Shoring and Underpinning of Construction & Building Materials