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Pick out the correct staments about optical fibres from the following:
S1: Optical fibres are used for the transmission of optical signals only
S2: Optical fibres are used for transmission of optical electrical signals
S3: The intensity of light signals sent through optical fibres suffer very small loss
S4: Optical fibres effectively employ the principle of multiple total internal reflections
S5: Optical fibres are glass fibres coated with a thin layer of a material with lower refractive index
A. S1 and S2
B. S2 and S3
C. S3 and S4
D. S2, S3, S4 and S5

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