Under Which of the Following Circumstances in the Public Sector

Under which of the following circumstances in the public sector is an employer allowed to take unilateral action?

A) The employer is unable to meet the financial demands of the union due to insufficient profits.
B) The employer proves that the union has demonstrated bad faith bargaining.
C) The union and the management are unable to reach an agreement after negotiating for a week.
D) The union declares an impasse and declines the employer's offer to meet again.