Match Column-I with Column-II regarding Vijayanagara Empire and choose the correct option:
| Column-I (Travellers who visited Vijayanagara Empire) | Column-II (Country they belonged) |
|---|---|
| I. Nicolo de Conti | a. Persia |
| II. Abdur Razzak | b. Portugal |
| III. Duarte Barbosa | c. Italy |
| IV. Afanasi Nikitin | d. Russia |
I. Nicolo de Conti - c. Italy: Nicolo de Conti was an Italian merchant and traveler who visited Vijayanagara in the early 15th century, and his accounts are valuable for understanding the state and life at the time.
II. Abdur Razzak - a. Persia: Abdur Razzak was a Persian diplomat and traveler who visited the Vijayanagara Empire in the mid-15th century, and his accounts provide detailed information about the empire and its capital city.
III. Duarte Barbosa - b. Portugal: Duarte Barbosa was a Portuguese writer and officer who visited Vijayanagara in the early 16th century, and his descriptions of the city provide insights into its trade networks and maritime activities.
IV. Afanasi Nikitin - d. Russia: Afanasi Nikitin was a Russian merchant who traveled through the Bahmani Sultanate and parts of south India, including the regions near Vijayanagara in the mid 15th century.
With reference to the land revenue system of the Mughals, match Column-I with that of Column-II:

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?