With reference to 'LiFi', recently in the news, which of the following statements is/are correct?1.It uses light as the medium for high-speed data transmission.2.It is a wireless technology and is several times faster than 'WiFi'.Select the correct answer using the code given below

1. A

   1 only

   Statement 1 only. LiFi does use visible or other light as the carrier, but the second claim—that it is wireless and can be many times faster than WiFi—is also treated as correct in this item. 1 alone is not the key.

2. B

   2 only

   Statement 2 only. Speed and wireless character are right, yet the defining medium is light. Dropping 1 is not the key.

3. C

   Both 1 and 2

   Both 1 and 2. Light Fidelity modulates LED or laser light for data. It is a wireless optical link and laboratory and vendor claims put peak rates far above typical WiFi. That stored letter is the official key.

4. D

   Neither 1 nor 2

   Neither. Both listed statements match the LiFi idea that was in the news, so ‘neither’ is not the key.

Summary. Official key is (c) both 1 and 2. LiFi is optical wireless communication: photons instead of radio. It can be very fast in line-of-sight LED/laser setups and does not replace radio where walls block light. Honour the stored letter (c).