Billy, who is studying Java, wants to learn how to build a mobile application and decides to research online. He finds a code and modifies it. He needs an open platform so that he can download the application on his device and use it for testing. Which of the following mobile operating systems should Billy choose?
A. ?Android
B. ?iPhone OS
C. ?BlackBerry OS
D. ?HPwebOS
Answer: A
Computer Science & Information Technology
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