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Consider the following statements in the context of high pressure boilers:

1.  The tendency of scale formation is eliminated due to high velocity of water through tubes.

2.   The heat transfer coefficient is increased by increasing the velocity of water through tubes.

3.  The steam can he raised quickly to meet the variable load.

Which of the statements given above are correct?

A) 1 and 2 only                 

B) 2 and 3 only

C) 1 and 3 only                 

D) 1, 2 and 3