Joe has been working for Company A for a total of four years. Company A offers Joe a 401(k) plan. At the end of the fourth year of working at Company A, Joe leaves and begins working for another employer - Company B. Company B also offers a 401(k) plan. When Joe leaves Company A, his 401(k)-account balance is $ 108,000, of which: • Company A's contribution = $60,000 . Joe's contribution = $40,000 Interest earnings = $8,000. a. Upon leaving Company A, how much of the 401(k)-account balance can Joe take with him at a minimum? b. If Company A uses a three-year cliff vesting schedule, how much of the 401(k)-account balance can Joe take with him in total? C. If Company A uses a graded 2-6 vesting rule, how much of the 401(k)-account balance can Joe take with him in total?