Consider the following conditions for the pipe network shown in the given figure (Notations have the usual meaning with suffixes 1, 2 and 3 referring to respective pipes) -
(1) Q1 = Q3
(2) Q2 = Q1 + Q3
(3) hf1 = hf3
(4) hf1 = hf2 = hf3
Which of these conditions must be satisfied by this pipe network?
1
2 and 3
2
1 and 3
3
1 and 4
4
2 and 4