Step 1: Defining Seasonal Unemployment.
This occurs when people are out of work because their industry only requires labor during certain times of the year (e.g., agriculture during the harvest or sowing season). Matches with (c).
Step 2: Defining Self-employed.
These are individuals who operate their own business or profession and earn income by utilizing their own resources and labor. Matches with (b).
Step 3: Defining Unorganised Sector.
This sector includes small, scattered units usually outside government control, characterized by low wages and a lack of job security. Matches with (a).
Step 4: Defining Disguised Unemployment.
A situation where more people are working than required; if some are removed, total production remains unchanged. Matches with (d).
Step 5: Final Matching.
Following these definitions, the correct combination is (i)-(c), (ii)-(b), (iii)-(a), and (iv)-(d).
Final Answer: (i)-(c); (ii)-(b); (iii)-(a); (iv)-(d).