Explanation:

Both statements 1&3 are correct.

• Optical fibre is the backbone of the digital infrastructure — the data is transmitted by light pulses travelling through long strands of thin fibre.
• Metal wires are preferred for transmission in optical fibre communication as signals travel with less damage. 
• The optical fibre works on the principle of total internal reflection (TIR).
• Light rays can be used to transmit a huge amount of data (In case of long straight wire without any bend).
• In case of a bend, the optical cables are designed such that they bend all the light ray's inwards (using TIR).

Hence option 3rd is correct.