Seven resistances are connected as shown in the figure. The equivalent resistance between A and B is:

1. $3\Omega$
2. $4\Omega$
3. $4.5\Omega$
4. $5\Omega$

The given circuit can be simplified as follows:

Ref. image 1

Now,

Ref. image 2

Now the balence Wheat stone bridge.

Therefore,

Ref. image 3

Hence,

$R_{AB}=\frac{8\times 8}{8+8}$

$=\frac{64}{16}$

$=4\Omega$