Which of the following practices at the company Enron likely promoted unethical behavior among employees? $($Choose every correct answer.$)$

Multiple select question.

Establishing a review board to ensure that employee conduct adhered to company policy

Pursuing an aggressive performance evaluation process that led to dismissal of employees who did not bring in enough revenue

Encouraging employees to operate outside of company policy to raise revenues

Celebrating the wealth of high$-$performing employees to motivate other employees to match the star team's work results