At which of the following ages must an individual begin to take required minimum distributions...

Required minimum distributions from a traditional individual retirement account generally begin at age 73 under the current SIE-tested framework reflected by the answer choices. A traditional IRA receives tax-deferred treatment, meaning taxes are generally postponed until distributions are taken. Because the IRS does not allow indefinite deferral, the account owner must begin taking required minimum distributions once the applicable RMD age is reached. Choice D is correct. Age 59½ is significant because it is generally the age at which withdrawals from retirement accounts can be taken without the additional early distribution penalty, but it is not the required beginning age for RMDs. Age 65 is commonly associated with Medicare eligibility and retirement planning, but it is not the RMD trigger in this question. Age 66 is associated with certain Social Security full retirement age concepts for some individuals, not traditional IRA RMDs. The SIE outline includes retirement account types and characteristics, required minimum distributions, and contributions under customer account registrations. The exam focus is recognizing the mandatory distribution rule for traditional IRAs. Reference: Section 3.2.2 Customer Account Registrations; Retirement Accounts; Required Minimum Distributions.