They related to payment for releases, time for employees to think about it, and other rules. New regulations also require that companies give older prospective layoffs a lot of information. Moreover, the information must go to exactly the right people. This is voluntary. The company offers a deal, often including early-retirement provisions.
Employees are free to take it or leave it.
The company selects workers. This is vague and general. Such language can get businesses into federal problems that they can't win. To clear this up, the EEOC goes into more detail. It depends on what's going on.