Last week, Dell's manager fired him for continually coming to work late. In the event that Dell attempts to sue the manager for unjustly firing him, what would help the manager's case?

testimonies by other group members that the manager practiced management by walking around

the manager giving his word that Dell was frequently warned

a history showing the manager promotes the use of groupware

an electronic trail of the formal warnings the manager gave to Dell

a history showing the manager assumes all male employees are more likely to be late