According to formwork practice (ACI SP-4), which condition generally increases lateral pressure of fresh concrete on wall or column forms?

1. A slower pour rate in warm weather, which lets the concrete set as it rises
2. A faster pour rate and cooler concrete, which keep the mix fluid over a greater height
3. Using a stiffer, near-zero slump mix placed in shallow lifts
4. Waiting to place until the previous lift has already hardened