Which of these thermodynamic relations are correct?

Question

Consider the following thermodynamic relation                          

1. Tds = du + pdV

2. Tds = du – pd V

3. Tds = dh + V dp

4. Tds = dh – V dp

Which of these thermodynamic relations are correct?

(a) 1 and 3                   (b) 1 and 4

(c) 2 and 3                   (d) 2 and 4