Jack and his father, Geoff, residents of California, bought a 45' sailboat in 2010 and took title as joint tenants with right of survivorship. Jack contributed 20% toward the cost of the sailboat. The balance of Jack's and Jill's assets are owned as Community Property. Jack and his wife, Jill, were married in 2017 and have resided in California their entire lives. Jill hates to sail. Last week, Jack was tragically killed in an automobile accident in town. Which of the following statements is correct? a. Jill will receive a full basis adjustment equal to date of death value of all assets except for the sailboat. b. Geoff will be entitled to a full basis step-up in the value of the sailboat due to Jack's death since California is a Community Property jurisdiction. c. The full value of the sailboat will be included in Jack's gross estate because he was the first co-tenant to die and he is Geoff's son. d. Jack's gross estate will exclude 20% of the value of the sailboat as appraised on his date of death.