20. The circuit shown below has been connected for a long time. Now the battery is disconnected. What is the time required for the capacitor to discharge to one fourth of its initial voltage in terms of R and C? (ln2=0.693)

(A) 4.620 RC
(B) 2.495 RC
(C) 10.397 RC
(D) 4.990 RC
(E) 2.130 RC

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