Benefit of Continuous Integration

Question:
Which of these is a benefit of Continuous Integration?

1. Being able to check in large batches (weeks of work) at one time
2. Being able to merge untested code into the master branch
3. Being able to get faster reaction time to changes
4. Being able to write the test cases after you have built the interface

Answer:
C - is the correct answer. You can move faster because all your tests are automated