Ian retired in June 2014 at the age of 69 (he turned 70 in August 2014). Ians retirement account was valued at $490,000 at the end of 2013 and $500,000 at the end of 2014. What is Ians required minimum distribution for 2015 under each of the following alternative scenarios?

A. Ian's retirement account is a traditional 401(k) account. Required minimum distribution:______________ B. Ian's retirement account is a Roth 401(k) account. Required minimum distribution:_______________ C. Ian's retirement account is a traditional IRA account. Required minimum distribution:_______________ D. Ian's retirement account is a Roth IRA. Required minimum distribution:_______________