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For the circuit shown in the figure, the Thevenin voltage and resistance looking into $\mathrm{X}-\mathrm{Y}$ are

1. $4 / 3 \mathrm{~V}, 2 \; \Omega$
2. $4 \mathrm{~V}, 2 / 3 \; \Omega$
3. $4 / 3 \mathrm{~V}, 2 / 3 \; \Omega$
4. $4 \mathrm{~V}, 2 \; \Omega$