Match the following:

1. Thickseam Extraction	a. Double Unit Face
2. Bord and Pillar Extraction	b. Jet Pearcing
3. Longwall Face Development	c. Inclined Slicing
4. Hydraulic Mining	d. Half Moon

A. 1-c, 2-d, 3-a, 4-b

B. 1-c, 2-b, 3-c, 4-d

C. 1-b, 2-a, 3-d, 4-c

D. 1-d, 2-c, 3-a, 4-b

Answer: Option A