Power Pro, a leading manufacturer of lawn and garden equipment, releases a new line of cordless, lightweight, electric weed trimmers. To boost sales, Power Pro issues a 50 percent off coupon to the first 100 buyers at all Home Depot stores in the Northeast. Which element of the promotion mix has Power Pro used in this scenario?

1. public relations
2. personal selling
3. sales promotion
4. advertising
5. crowdsourcing