To Postpone Income Tax Obligations as Long as Possible, Retirement

To postpone income tax obligations as long as possible, retirement assets should be taken from which assets (or accounts) first?

A) Section 457 accounts of government employees since no penalties apply once the employee is separated from employment.
B) Section 401(k) and nonprofit § 403(b) plans because the age 55 separation rule may apply.
C) Traditional IRAs since a taxpayer must be at least age 59 1/2 to obtain penalty-free withdrawals.
D) Roth IRAs since no required minimum distribution rules apply.
E) Taxable accounts.