For flexible metal conduit, if flexibility is necessary after installation, unsecured lengths from the last point the raceway is securely fastened must not exceed _____ . a) 3 ft for trade sizes 1/2 through 1 1/4 b) 4 ft for trade sizes 1 1/2 through 2 c) 5 ft for trade sizes 2 1/2 and larger d) all of the above

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