A is corrent. The requirement is to identify the type of computer that end-user computing is most likely to occur on. End-user computing involves individual users performing the development and execution of computer applications in a decentralized manner and these individuals are most likely to be using personal computers.
B is incorrect because it represents computers less frequently used by end users.
C is incorrect because "personal digital devices"generally do not have sufficient computing power.
D is incorrect because it represents computers less frequently used by end users.
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