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Which of the following is/are not correct?

1. The unit of measurement of Sun's radiation is Langley.

2. The incoming solar radiation to earth is 2 cal/cm2-min

3. The mean sea level pressure of atmosphere is 1013.2 bar.

4. We are normally not aware of atmosphere pressure because it acts in all directions.

Select the correct answer from the codes given below:

A)  1, 2, 3 and 4        

B)  2, 3 and 4

C)  3 only              

D)  None of these