Which of the following promises does not have to be evidenced by a writing or electronic record in order to be enforceable?

Select one:

a$.$ Stewart's promise to work for Austin for a two$-$year period.

b$.$ Mindy's agreement with Susan to buy her bike for $$400.$

c$.$ Jones's agreement with Smith to sell his condominium for $$100,000.$

d$.$ Dad's promise to the credit union that he will make payments on his son's truck.