A second harmonic has to be generated in a string of length l stretched between two rigid supports. The point where the string has to be plucked and touched are 

(1) Plucked at l4 and touch at l2

(2) Plucked at l4 and touch at 3l4

(3) Plucked at l2 and touched at l4

(4) Plucked at l2 and touched at 3l4

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