Which of these is considered as one of the biggest challenges to testing mobile applications?

Name: Which of these is considered as one of the biggest challenges to testing mobile applications?
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Question

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The frequency of release cycles in mobile applications is considered as one of the biggest challenges to testing as it can make it difficult to keep up with the changes and ensure that the app is consistently performing well. A, C, and D can also be challenges, but they are not considered as big as B.

Which of These Is Considered as One of the Biggest