| List-I | List-II |
|---|---|
| (A) STAR TOPOLOGY | (I) Each communicating device is connected to a central node. |
| (B) LAN | (IV) Type of network. |
| (C) HUB | (II) Networking device. |
| (D) VoIP | (III) Protocol. |

A ladder of fixed length \( h \) is to be placed along the wall such that it is free to move along the height of the wall.
Based upon the above information, answer the following questions:
(iii) (b) If the foot of the ladder, whose length is 5 m, is being pulled towards the wall such that the rate of decrease of distance \( y \) is \( 2 \, \text{m/s} \), then at what rate is the height on the wall \( x \) increasing when the foot of the ladder is 3 m away from the wall?