David Collins died during the current year. The personal representative of David's estate identified the following assets. Stocks in David's name only $2,000,000 Investment property in a trust that David has the right to revoke 1,500,000 Primary home owned jointly with his spouse (spouse did not contribute to the purchase) 1,000,000 Insurance policy owned by and insuring David with the proceeds payable to his daughter 800,000 Vacation home owned jointly with his son (son did not contribute to the purchase) 500,000 Cash placed in an irrevocable trust by David eight years ago with David's friend as trustee 600,000 What is the value of David's gross estate for estate tax purposes? a. $3,500,000 b. $4,250,000 c. $5,300,000 d. $6,400,000