Background: Decedent, age 83, left all his assets, described below, to two beneficiaries, also described below.

1. To wife, named Widow, age 78:
   1. Decedents left his entire Roth IRA to Widow. Decedent had started saving in the Roth IRA in 2010. Decedent had contributed and rolled over funds into the Roth IRA that totaled $200,000. Decedent had never taken a distribution from the Roth IRA account. The Roth IRA had a FMV of $570,000 upon Decedents death.
   2. Full title to their home transferred automatically transferred to Widow. Thats because when Decedent and Widow had purchased the home together 52 years ago, they titled their ownership as tenants by the entirety. Their original purchase price was $100,000. Current FMV $800,000.
   3. Decedent left to Widow his entire portfolio of individual stocks, which Decedent had owned individually, NOT jointly with Widow. Decedent had purchased the stocks at various times. The most recent purchases, totaled $70,000, was four months ago; they were the only purchases in the past year. All told, the original combined cumulative purchase price for all shares was $300,000, with a current FMV of $740,000.
2. To Only Child, named Daughter, age 44:
   1. Decedent left his entire Traditional IRA to Daughter. Decedent had first started investing the in Traditional IRA 20 years ago. When Decedent had reached age 70, he correctly started taking required minimum distributions (RMDs) from the Traditional IRA. Decedent had contributed and rolled over funds into, and had taken RMDs from the Traditional IRA such that his account had a basis of $0, with a current FMV of $900,000 as of Decedents date of death.

Question:

1. Explain how Decedent could have designated the Traditional and Roth IRA beneficiaries and the stock investments without having used a will.

Please provide a detailed explanation for each part in sentence format!