NYT - When an algorithm sends you to prison

https://www.nytimes.com/2017/10/26/opinion/algorithm-compas-sentencing-bias.html

According to the NYT article "When an algorithm sends you to prison", which of the following is true:

• Algorithms cannot be biased because humans are not involved in any part of the process
• f the data used to train algorithms is biased, then predictions based on algorithms can reflect the same biases
• Algorithms can not only make predictions, but also useful causal statements, which can lead to more accurate policy making
• All of the above