Consider the following statements:

In water supply distribution network, the dead-end system is not favoured because

1.   it is cumbersome in terms of design.

2.   the pressure at the dead-ends becomes undesirable low in the case of additional extensions.

3.   it is difficult to maintain residual chlorine levels at the dead-ends.

4.   at the time of repairs,  service connections beyond the point of repair are deprived of water.

Of these statements