Read the example below and think about the writer's tone. Running as a form of exercise is easy to do because it does not require any special equipment. You will need good shoes, but you may already have a pair that will work. Besides that, the only other thing you will need is a safe place to run. Often people run in their neighborhood or in a park. Others use a treadmill or run at a track, but any of these options, as long as they are safe, can provide a place to get an excellent workout.

How does the writer establish credibility through her tone?

1 by adhering to the conventions of standard written English
2 by using a mix of formal and informal language
3 by using colloquialisms and idioms
4 by using a variety of sentence types and lengths