59. Eight resistors of equal length, each of resistance R, are connected along the edges of a regular square pyramid: four resistors form the square base, and four resistors connect each base vertex to the apex as shown below. What is the equivalent resistance between point A and B of the square base?
(A)
(B)
(C) R
(D)
(E) 2R

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統計： A(0), B(1), C(0), D(0), E(0) #3847835