Which concrete smoothing technique involves scrubbing a mixture of cement mortar over the concrete surface using ai cement sack, gunny sack, or sponge rubber float?

Which concrete smoothing technique involves scrubbing a mixture of cement mortar over the concrete surface using ai cement sack, gunny sack, or sponge rubber float?
A . Sacking
B . Acid etching
C . Stoning
D . High-pressure water washing

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Answer: A