When preparing an "aggregate operations planning" for a firm producing bicycles, which approach would the planners most likely utilize?
a) Units of bicycles as an equivalent unit of production but be concerned with the different colors to be produced.
b) All the different sizes to be produced.
c) All the different sizes and all the different colors to be produced.
d) Units of bicycles as an equivalent unit of production, without concern for the different colors to be produced.