It's a relative pronoun functioning as Complement of the preposition "by". Edit: you asked what "which" referred to; it refers to "method".
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It's a relative pronoun functioning as Complement of the preposition "by".
Edit: you asked what "which" referred to; it refers to "method".
Jigneshbharatiwhat does it refer to or represent?
The antecedent of 'which' is 'method'.
CJ