Based on the article, which of these is true about step goals?

Research has clearly shown that getting 10,000 steps daily is a good idea for everyone.
Getting 10,000 steps daily has been proven by researchers to make people unhappy.
Getting 10,000 steps daily may be good exercise, but tracking them can be discouraging.
Research has clearly shown that not getting 10,000 steps daily puts optimal health at risk.

Research has clearly shown that getting 10,000 steps daily is a good idea for everyone.