Consider the following statements : Sand in mortar is needed for 1. decreasing the quantity of cement. 2. reducing shrinkage. 3. decreasing the surface area of the binding material. 4. increasing the strength. Of these statements :

• 2, 3 and 4 are correct
• 1, 2 and 3 are correct
• 1, 3 and 4 are correct
• 1, 2 and 4 are correct