Pick up the correct network for the activities of pouring concrete, erection of form work, removal of form work and curing of concrete from the following:

• 1. Pouring of Concrete 2. Erection of form work 3. Curing of concrete 4. Removal of form work
• 1. Erection of form work 2. Pouring of concrete 3. Curing of concrete 4. Removal of form work
• 1. Removal of form work 2. Erection of form work 3. Pouring of concrete 4. Curing of concrete
• 1. Pouring of concrete 2. Curing of concrete 3. Erection of form work 4. Removal of form work