Castillo Coal Mines has a pension plan that is designated as a "qualified employer pension plan" and chooses to use a graduated schedule for their vesting requirements. Castillo Coal Mines contributes $2,000 per year to each employee's pension plan. Employees do not contribute anything. Sophia works for Castillo Coal Mines for five years and then quits. How much of the contributed money in her pension plan will be available to Sophia when she retires?

$0 $5,000 $8,000 $10,000