Consider the following statements in respect of ground water aquifers: 
1) Specific storage is specific capacity per unit depth of the aquifer. 
2) Specific capacity is storage coefficient per unit aquifer depth. 
3) Specific capacity is a constant for a given well. 
4) For one-dimensional flow in a confined aquifer between two water bodies, the piezometric head line in the aquifer is a straight line. 
Which of the above statements are correct?