An author's credentials can determine a health source's credibility. None of the other options would apply to credibility. When it comes to health, if you want to make sure that what you are researching or reading is authentic and reliable you need to find out whether the author is a professional health expert or not. You can do this by finding out their credentials.
Personality traits are traits that reflect the person's thoughts feelings and behaviors. All of the choices provided describe different traits a person could have therefore all of the choices are correct
Fun fact: i don’t think any of us asked
