What is the reciprocal of the sum of the...

What is the reciprocal of the sum of the reciprocals of `frac(3) (5)` and `frac(7)(3)` ?
(A) `frac(4)(5)` (B) `frac(36)(35)` (C ) `frac(21)(44)` (D) `frac(1)(4)`

A

B

C

A

D

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