Which of these employees is exemplifying the Pollyanna principle?

Ivan is impulsive and always promises clients that a product will ship the next day before he even checks with the warehouse.

As an accountant, Luis thought it was better for the company to buy in bulk rather than a la cart because they would save money.

Nadia suggested that incorporating the company logo on every piece of marketing material would improve customer relations.

Even though her boss had also told her he was disappointed in her last sales report, Heidi told her coworker that the boss said he appreciated her enthusiasm and the way she interacted with clients.