With $10$ V dc connected at port A in the linear nonreciprocal two-port network shown below, the following were observed:

1. $1 \: \Omega$ connected at port B draws a current of $3$ A
2. $2.5 \: \Omega$ connected at port B draws a current of $2$ A

With $10$ V dc connected at port A, the current drawn by $7 \: \Omega$ connected at port B is

1. $3/7$ A
2. $5/7$ A
3. $1$ A
4. $9/7$ A
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