As flextime, consulting, telecommuting, and downsizing make it more difficult for people to donate blood at the workplace, Canadian Blood Services has launched a CRM marketing campaign in Toronto to boost awareness and repeat donations. Early in the campaign, it went to its listings of previous donors and pulled out those with birthdays in February, March, and April. These donors were sent a birthday card with the greeting, "On the anniversary of your life, would you consider saving another's life?" Refer to the scenario. What is the card sent by the organization an example of?