Region in which a transistor must work as an amplifier or as a switch

This type of question, asked 2 times: 2021 Paper 20, 27 Jun 2022. All 2 questions below, oldest first.

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Question 1
2021 Paper 20
11 $For a transistor in CE mode to be used as an amplifier, it must be operated in:$
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Question 2
27 Jun 2022
109 $For a transistor to act as a switch, it must be operated in$
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