Why avoid fixed sleeps and mixing implicit with explicit waits?

QuizMediumAsked in: Accenture

Which statements are true? Choose all that apply.

Choose all that apply.

A fixed sleep always costs its full time and can still be too short on a slow run
Selenium's documentation says not to mix implicit and explicit waits because wait times become unpredictable
Mixing implicit and explicit waits does not compile
An explicit wait returns as soon as its condition is true

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