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Question

Consider the following statements related to 'non-destructive testing' of concrete:
1. Indentation test is used to assess the quality of concrete.
2. The Resonant Frequency Method is based on a laboratory test.
3. Compressive strength of concrete is estimated through Pulse Velocity Measurement.
4. Dynamic Modulus of Elasticity is determined by a Sonometer Test.
5. Thickness of concrete can be estimated by in-situ Rebound Hammer Test.
Which of the above statements are correct?

A
1, 2 and 3 only
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B
1, 2 and 5 only
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C
1, 2, 3 and 4 only
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D
1, 2, 3, 4 and 5
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