Rob filed a will dated $5/3/2012$ with the court and is seeking appointment sd personal representative of his fathers estate. Sara knows that her father was diagnosed with Alzheimer's disease in late $2011.$ Sara intends to object to the probate of her father's will. Which of the following should be the basis for her objection? a$)$ the testor improperly filed the will. b$)$ the will was revoked by a later will. c$)$ the testator lacked legal capacity. d$)$ the will was improperly executed