If the contributions of tricalcium silicate, dicalcium silicate, tricalcium aluminate and tetra calcium alumino ferrite to the 28 days strength of hydrated ordinary Portland cement are respectively W, X, Y and Z, then

- 1
  
  W>X>Y>Z
- 2
  
  X>W>Y>Z
- 3
  
  W>X>Z>Y
- 4
  
  W>Y>X>Z

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