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A class - A transformer coupled, transistor power amplifier is required to deliver a power output of $10$ watts. The maximum power rating of the transistor should not be less than

1. $5 \mathrm{~W}$
2. $10 \mathrm{~W}$
3. $20 \mathrm{~W}$
4. $40 \mathrm{~W}$