When changing jobs, the preferred way of handling your 401K account balance with your old employer is to:

a) Convert your account balance with your old employer to cash and use it to pay off your mortgage balance.

b) Have the 401k service provider at your new place of employment arrange to have your old account balance placed in an account at your new employers 401K plan in what is known as a provider to provider rollover.

c) Have your old employer write a check to you for your account balance with your old employer so that you can deposit that check with your new employer.