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The employee handbook of Good Life Inc. states that salaried employees who work late can accrue vacation days at a rate of one day of vacation for every $20$ hours spent working after regular business hours. Bistra has worked $100$ hours of overtime and books a nonrefundable dream vacation. Bistra asks for the days off but is denied by the manager, who claims the policy recently changed and just hadn't been updated in the handbook. Which of the following statements is true?

a$.$ The employee handbook creates a contract, unless there is an explicit statement in the handbook itself saying that it is not a contract. Bistra is entitled to the time off.

b$.$ The employee handbook is not a binding contract on the company, and Bistra is not entitled to the time off.

c$.$ As an at$-$will employee, Good Life Inc. has sole discretion in deciding when Bistra can take vacation, and that decision is not reviewable by courts.

d$.$ Although it creates a contract, an employer can modify an employee handbook at any time, without the knowledge of or consent of the employees. Bistra is not entitled to the time off.