Gorman Industries, LLC wants to give a short survey to a sample of hires who have been with the company for less

Gorman Industries, LLC wants to give a short survey to a sample of hires who have been with the company for less than one year, roughly several thousand employees. They want to be able to establish a confidence interval for the proportion of new hires that are happy with Gorman Industries.
Plan 1: The HR manager will wait at the entrance as people are entering and leaving a quarterly employee communications meeting. Whenever he sees someone with a red badge, which indicates under one year with Gorman Industries, he will hand them a survey packet with instructions on completion.
Plan 2: E-mail new employees with the packet attached and request they complete it and e-mail it back within three days.
Which plan would you use and why?