Mary wrote a will which stated I will all my realty to my children, but if after 10 years after my death my husband; Ben is still alive, then to Ben. Mary dies and the will is offered for probate. At the time of Mary's death what interest in the realty did the will create in Ben?

Select one:

a. a valid contingent remainder.

b. a valid executory interest.

c. an invalid contingent remainder.

d. an invalid executory interest.