What Is the Equivalent Resistance Between Points a and B $\Omega$

Multiple Choice

What is the equivalent resistance between points A and B in the figure when R = 10 $\Omega$ ?

A) 20 $\Omega$
B) 10 $\Omega$
C) 25 $\Omega$
D) 15 $\Omega$
E) 3.2 $\Omega$