Consider the following methods of preservation of timber :

1. Pressure application

2. Brush application

3. Dipping

4. Open tank

The correct sequence of these methods in the increasing order of their effectiveness is : 

1
1, 3, 4, 2
2
3, 4, 2, 1
3
2, 3, 4, 1
4
4, 2, 1, 3

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