Tony dies intestate, survived by Lisa, his mother; Grace, his wife; Abby and Selena, his two daughters; and Brock, his grandson. Brock is the son of Cliff, Tony’s son, who has already died. Under intestacy laws,

a. Grace receives one-third of Tony’s estate, and Abby, Selena, and Brock receive equal portions of the rest.

b. Abby and Selena receive half of Tony’s estate, and Grace receives the rest.

c. Lisa and Grace receive equal portions of Tony’s estate.

d. Grace receives all of Tony’s estate.