An employee is being laid off by his employer. During the period of time leading up to the company's downsizing, the employee had received a promotion. The employee was supposed to receive stock options at the time of promotion, and those stock options should have vested, but the company's HR department made a mistake. Due to that mistake it took several months for the stock options to be granted to the employee, and due to that delay the stock options have not yet vested.
Does the employee have the right to exercise the stock options, or will they be unable to do so based upon the employer's mistake?

