Consider the following statements regarding underreamed piles :1. They are used in expansive soils.2. They are of perkcast reinforced concrete.3. The ratio of bulb to shaft diameters is usually 2 to 3.4. Minimum spacing between the piles should not be less than 1.5 times the bulb diameter. of these statements :

Consider the following statements regarding underreamed piles :1. They

1.	Consider the following statements regarding underreamed piles :1. They are used in expansive soils.2. They are of perkcast reinforced concrete.3. The ratio of bulb to shaft diameters is usually 2 to 3.4. Minimum spacing between the piles should not be less than 1.5 times the bulb diameter. of these statements :
A.	1, 2 and 3 are correct
B.	1, 3 and 4 are correct
C.	2, 3 and 4 are correct
D.	1, 2 and 4 are correct
Answer» C. 2, 3 and 4 are correct

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