Which of the following is a major difference between Android and Apple's iPhone Operating System $($iOS$)?$

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option

A

Android is an open$-$source OS whereas iOS is not.

option

B

Android components are based on the Darwin Unix kernel, while those of iOS are not.

option

C

Android is currently incapable of running standard applications such as those of Microsoft Office.

option

D

The basic components of Android are completely different than those of iOS.