Henrietta has a family history of Alzheimer's and is worried that the disease might affect her as well. Henrietta doesn't believe that her children will be capable of making the necessary decisions regarding her care if the disease strikes her, so she wants to give her brother authority to make personal care decisions on her behalf. How can Henrietta give her brother this authority? a. in a power of attorney for property

b. in her will

c. in a codicil to her will

d. through a living will