Explain ehernet cable and its structure.

With reference to 'Li-Fi', 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 'Wi-Fi'.

Select the correct answer using the codes given below:

Write the quadrants in which the following points lie:

$\left(-4,7\right)$