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 = 20 $\Omega$ ?

A) 77 $\Omega$
B) 63 $\Omega$
C) 70 $\Omega$
D) 84 $\Omega$
E) 140 $\Omega$