Which of the following explanations best captures the genetic explanation for this?

A child possesses a trait that is the result of the interaction of two different genes, neither of which could have produced the trait independently. Which of the following explanations best captures the genetic explanation for this?
The trait is an expression of multiple alleles.
Epistasis has dictated the phenotypic outcome.
The phenomenon is an example of polygenic inheritance.
The outcome is the result of the interaction between collaborative genes.

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