When the union went on strike, the company replaced Ashley, a union member, with Ben, a nonunion ...

When the union went on strike, the company replaced Ashley, a union member, with Ben, a nonunion member. The strike is now over, and a Federal court has ruled that this was a ULP strike. Does Ashley get her job back?
 a. The company is obligated to hire Ashley, even if that requires laying off Ben.
  b. The company is obligated to hire Ashley unless that would require laying off Ben.
  c. The company is obligated to hire Ashley only if Ben voluntarily leaves.
  d. The company's only obligation is to notify Ashley of future job availability.
  e. The company has no obligation at all to Ashley.