Match the processes in Group I with the objectives in Group II.

Group I	Group II
P. Vacuum Arc Degassing (VAD)	1. Primary iron making
Q. LD	2. secondary steel making
R. COREX	3. Direct smelting
S. Blast Furnace	4. Primary steel making

Vacuum Arc Degassing (VAD) is a refining process used after primary steel making to remove dissolved gases and improve steel quality, hence it belongs to secondary steel making.

LD process (Basic Oxygen Furnace) converts hot metal into steel by oxidizing impurities and is classified as primary steel making.

COREX process produces hot metal directly from iron ore without using coke ovens and sinter plants, therefore it is a direct smelting process.

Blast Furnace is used to extract iron from iron ore and is the main process for primary iron making.

Thus, the correct matching is P-2, Q-4, R-3, S-1, which corresponds to Option D.