Three years ago, Albert Brown was hired at as an accountant at Ace Computers, Inc. Ace has a 401(k) plan with a six year graduated vesting schedule that matches employee contributions dollar for dollar up to 3% of an employees salary. Albert earned $60,000 in year 1, $62,000 in year 2, and $64,000 In year 3. Each year, he contributed $5,000 to his 401(k) plan. He left Ace at the beginning of year 4. What amount of his 401(k) plan can he take with him?

a. $0

b. $15,000

c. $17,232

d. $20,580