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In the following limiter circuit, an input voltage $V_{i}=10 \sin 100 \pi t$ is applied. Assume that the diode drop is $0.7 \mathrm{~V}$ when it is forward biased. The Zener breakdown voltage is $6.8 \mathrm{~V}$.

The maximum and minimum values of the output voltage respectively are

1. $6.1 \mathrm{~V},-0.7 \mathrm{~V}$
2. $0.7 \mathrm{~V},-7.5 \mathrm{~V}$
3. $7.5 \mathrm{~V},-0.7 \mathrm{~V}$
4. $7.5 \mathrm{~V},-7.5 \mathrm{~V}$