Assuming an ideal transformer, the Thevenin’s equivalent voltage and impedance as seen from the terminals $x$ and $y$ for the circuit in figure are
1. $2$ $sin(wt)$ , $4Ω$
2. $1$ $sin(wt)$ , $1Ω$
3. $1$ $sin(wt)$ , $2Ω$
4. $1$ $sin(wt)$ , $0.5Ω$