a$.$ Operating on a functional basis is what got Apple to where it is with its successful collaboration in bringing sought$-$after products to the market. With its past in mind, changing to a division structure is just too difficult and potentially dangerous for Apple.

b$.$ Divisional structure versus functional structure may be an incorrect framing of the issue. Apple needs to look at ways to combine the best collaborative and innovative attributes of a functional structure with the superior organization of a division structure.

c$.$ A company that is already big and wants to grow bigger needs to recognize the shortcomings of a functional structure in such a situation and proceed with shifting to a divisional structure.