Project managers must determine the time and effort needed to complete a task or activity. Which of the following options considers time and effort in a project schedule? a.) Mary has only one oven and a small microwave to cook her dishes and warm the guests' food. b.) Mary can bake a chicken in 30 minutes, but the total cooking time is 4 hours since the chicken has to be marinated prior to baking. c.) Mary needs to bake a chicken before cornbread, as the chicken bakes longer and at a different temperature. d.) Mary's homemade cornbread will be fresher than the cornbread mix that comes in a box from the grocery store