Which one of the following is not a part of the Deployment phase of a machine learning development project? Explain what phase(s) address this issue, and why then?

1. Training end users to incorporate the ML tool into their decision-making.
2. Devising a way to automate the data cleaning steps created in the Data Preparation phase.
3. Identifying which data will be available at the time that a decision needs to be made.
4. Ensuring production servers handle the workload with acceptable speed and uptime.