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. $\frac{3}{7}\: A$
2. $\frac{5}{7}\: A$
3. $1\: A$
4. $\frac{9}{7}\: A$
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