Which statement best distinguishes machine learning from a conventional algorithm?

1. A conventional algorithm follows fixed, explicitly human-written rules for every situation, whereas a machine-learning system infers patterns from data to improve its performance on a task
2. A conventional algorithm can only run on computers, while machine learning runs without any computer
3. Machine learning eliminates the need for data and produces certifiably correct answers
4. A conventional algorithm learns new rules by itself whenever the internet is available