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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's homemade cornbread will be fresher than the cornbread O mix that comes in a box from the grocery store. b.) Mary needs to bake a chicken before cornbread, as the chicken O bakes longer and at a different temperature. c.) Mary has only one oven and a small microwave to cook her dishes O and warm the guests' food. d.) Mary can bake a chicken in 30 minutes, but the total cooking time O is 4 hours since the chicken has to be marinated prior to baking